Accurate individual line intensities have been measured for the five interacting bands ?10, ?8, ?7, ?4 and ?6 of ethylene-1-13C using a multispectrum nonlinear least squares fitting technique. The measured intensities have been very satisfactorily fit leading to the determination of precise vibrational transition moments. A calculated spectrum accounting ...
NASA Astrophysics Data System (ADS)
By employing an electric field pulsing scheme for vacuum ultraviolet laser pulsed field ionization-photoion (PFI-PI) measurements, we have been able to prepare a rovibrationally selected PFI-PI beam of N(2)(+)(v(+) = 1, N(+)) with not only high intensity and high quantum state purity, but also high kinetic energy resolution, allowing ...
PubMed
By employing an electric field pulsing scheme for vacuum ultraviolet laser pulsed field ionization-photoion (PFI-PI) measurements, we have been able to prepare a rovibrationally selected PFI-PI beam of N2+(v+ = 1, N+) with not only high intensity and high quantum state purity, but also high kinetic energy resolution, allowing absolute ...
Using Fourier Transform spectra (Bruker IFS 120 HR, resolution ~0.004 cm-1) of NH3 in several branches of the ?2, 2?2 and ?4 bands, absolute line intensities have been determined at room temperature (T = 295 K) for more than 400 rovibrational lines located in the spectral range 1000-1800 cm-1. A non-linear least-squares multispectrum ...
Single or double ion chamber technique measures absolute radiation intensities in the extreme vacuum
NASA Technical Reports Server (NTRS)
... Accession Number : AD0481363. Title : ABSOLUTE AND RELATIVE SPECTRAL LINE INTENSITY MEASUREMENTS IN A PLASMA SHOCK TUBE. ...
DTIC Science & Technology
In this paper we report transition frequencies and line strengths computed for bright states of the NNO dimer. We use a previously reported potential obtained from explicitly correlated coupled-cluster calculations and fit using an interpolating moving least-squares method. The rovibrational Schroedinger equation is solved with a symmetry adapted Lanczos algorithm and an ...
A multispectrum nonlinear least-squares fitting technique has been used to determine the absolute intensities for approximately 1500 spectral lines in 36 vibration-rotation bands of 12C16O2 between 3090 and 3850 cm-1. A total of six absorption spectra of a high-purity (99.995% minimum) natural sample of carbon dioxide were used in the analysis. The ...
... COMPOUNDS, BROMINE COMPOUNDS, INTENSITY, CARBON TETRACHLORIDE, BENZENE, VAPORS. Subject Categories : ORGANIC ...
We report rigorous calculations of rovibrational energies and dipole transition intensities for hydrogen peroxide using a new version of MULTIMODE as applied to molecules with torsional (reaction path) motion. The key features which permit such calculations for moderately sized polyatomic molecules of this general type are briefly described. A previous, ...
We present phase-referenced maps of the SiO maser transitions v = 1 J = 1--0 and v = 2 J = 1--0 from the symbiotic stellar system R Aquarii, which hosts an evolved AGB star plus a hot companion. Observations were performed at two epochs: 2004.98 and 2005.98. Accurate absolute coordinates and proper motions of the emission centroid were obtained; the errors expected for these ...
... ABSOLUTE INTENSITY MEASUREMENTS FOR THE 1.38, 1.87 AND 2.7 MICRON BANDS OF WATER VAPOR BETWEEN 125 AND 200 C. ...
... Accession Number : AD0126797. Title : Calculations of Dipole Moments and Absolute Intensities of HF, HC1, and HBr. Corporate ...
Intensities of translational lattice mode absorptions of alpha phase solid molecular nitrogen in far
... Within the substructure of the angular and energy intensity profiles are the firs experimental observations of sideband diffraction. ...
... of a Prompt Gamma Ray Detector for Intense Bursts of Protons. ... for determining the intensity and duration of kiloampere pulsed proton beams is ...
The Primordial Inflation Explorer (PIXIE) is an Explorer-class mission to map the absolute intensity
... INTENSITY AND THE CONCENTRATION OF DROPLETS IN MISTS-ACADEMY OF SCIENCES USSR EARTH SCIENCE SECTIONS DOKLADY ...
... Title : COMMUNICATION BY ELECTRICAL SIMULATION OF THE SKIN. I. ABSOLUTE IDENTIFICATION OF STIMULUS INTENSITY LEVEL. ...
... BASED ON THE CHANGE IN ABSOLUTE INTENSITY OF ... A METHOD FOR DETERMINING THE TEMPERATURE STABILITY OF TRANSPARENT ...
... DIOXIDE, *INFRARED SPECTRA, GASES, ABSORPTION, HEAT OF REACTION, DETERMINATION, CHEMICAL EQUILIBRIUM, LIQUIDS ...
A 3-microm continuous-wave difference-frequency source is directly referenced to a mid-infrared optical frequency comb synthesizer by measuring their beat-note signal by a fast HgCdTe detector. Absolute frequency metrology of molecular vibration spectra is demonstrated by locking the 3-microm coherent radiation to the nearest comb tooth and tuning the comb mode spacing across ...
The calculation of rovibrational transition energies and intensities is often hampered by the fact that vibrational states are strongly coupled by Coriolis terms. Because it invalidates the use of perturbation theory for the purpose of decoupling these states, the coupling makes it difficult to analyze spectra and to extract information from them. One ...
Full configuration interaction (FCI) has been used in conjunction with the lithium [6s5p3d1f] (Iron, M. A.; et al. Mol. Phys. 2004, 101, 1345) and hydrogen aug-cc-pVTZ basis sets to construct an 83-point potential energy surface of the 1A1 ground state of 7LiH2+. Vibrational and rovibrational wave functions of the (6,7)LiH2+, (6,7)LiHD+, and (6,7)LiD2+ ground states were ...
Laser-induced emission of the Na2 molecule consisting of discrete molecular fluorescence series was observed in the gas phase at an excitation wavelength of 5145.308 � from an argon-ion laser. Eighteen fluorescence series for the B 1?u?X 1?+g band system have been observed and analysed. Several fluorescence series are reported for the first time. The radiative transition probabilities for the ...
XY6 octahedral molecules, like SF6, WF6 and UF6, reveal a localized behaviour in the excited states of their stretching mode upsilon3. This character may be described through the G U (3) K3 Ok group chain (Boujut, V., Michelot, F., and Leroy, C., 1998, Molec. Phys., 93, 879). In this paper, we extend our previous theoretical developments by: the construction of a symmetrized local ...
A new class of IR coherent sources and IR frequency combs, that combine optical frequency-comb synthesizers (OFCSs) and optical parametric up/down-conversions, is already available and still progressing at a very fast pace. Peculiar features for IR radiation produced by difference-frequency-generation (DFG) set-ups or quantum-cascade lasers (QCLs) can he achieved when they are phase and frequency ...
Titan has an extremely thick atmosphere dominated by nitrogen, but includes a range of trace species such as hydrocarbons and nitriles. One such hydrocarbon is propane (C_3H_8). Propane has 21 active IR bands covering broad regions of the mid-infrared. Therefore, its ubiquitous signature may potentially mask weaker signatures of other undetected species with important roles in Titan's chemistry. ...
Absolute intensities for the center of the solar disc are given in the spectral range from 6389 to 12480 A. The observations are made in exactly the same manner as described in Z. Astrophys. 55:269(1962) for the visible part of the spectrum. The infrared ...
National Technical Information Service (NTIS)
Positional distributions, absolute intensities, energy spectra, and angular distributions of energetic electrons and protons in the Jovian magnetosphere are discussed. (GRA)
Energy Citations Database
The Systeme International des Unites (SI) base unit for photometry, the candela, has been realized by using absolute detectors rather than absolute sources. This change in method permits luminous intensity calibrations of standard lamps to be carried out ...
Hourly data, and monthly and annual means of declination and horizontal and vertical intensity are tabulated. In 1971 absolute measurements of horizontal and vertical intensity were taken with a vector-protonmagnetometer. The absolute level of the declina...
A method for determination of absolute intensities of gamma-transitions in neutron resonances is developed. It is based on comparing two time-of-flight spectra measured simultaneously: spectrum of capture in the isotope under study and spectrum of neutron...
Absolute intensities and self-, air- and N2-broadened half-widths have been determined for the first
... of wind direction being extremely sensitive to changes in stability. The investigation also provided an insight to the variation of the absolute value ...
... Title : IONIZED MERCURY GAS IN THE HEATED SHOCK TUBE: THE MEASUREMENT OF RELAXATION TIMES AND ABSOLUTE INTENSITIES. ...
... Absolute negative conductance, unstable plasma oscillations and parametric amplificatoin of intense field harmonics destroy these states. ...
Measurements of absolute continuum intensities in the wavelength range 1420-1960 A are presented for
intensity; and (3) accurate prediction of the mean frequency of major absolute geomagnetic dipole excursions and axial dipole reversals. ...
NASA Website
... ATOMIC SPECTROSCOPY, COPPER, INTENSITY, ABSORPTION SPECTRA, HARTREE FOCK APPROXIMATION, VISIBLE SPECTRA ...
... what are believed to be significantly more reliable values for energetic electron (E sub e < 21 MeV) intensities within 10 Jovian radii of the planet. ...
... can be derived unambiguously from the intensity ratio of ... Regions Deduced from X-Ray Line Spectra, Astrophvs. ... Absolute intensities were recorded ...
Absorption infrared spectra have been computed for a variety of polycyclic aromatic hydrocarbon molecules of the pyrene family, taking into account anharmonicity and temperature effects, rovibrational quantization, and couplings. The energy levels are described by a second-order perturbative expansion of the rovibrational Hamiltonian in the vibrational and ...
A diagnostic technique for the local measurement of emissions from the molecular hydrogen has been developed. In the presence of an external magnetic field, the emission position can be deduced from the Zeeman patterns in the spectral line shape, and with the aid of the coronal model the rovibronic emission intensity provides the local rovibrational ...
... Accession Number : ADA196022. Title : Dissociative Electron Attachment to Rovibrationally Excited Molecules. Descriptive ...
Using multiple time scale analysis, the nonlinear saturation of the absolute stimulated Raman scattering instability is examined in a finite homogeneous collisional plasma. The amplitude of the incident wave is assumed to exceed the absolute instability threshold by the fractional amount ..delta..(<<1). A single backscattered wave and a single plasma ...
The majority of practical radioactive materials decay by modes that include {gamma}-ray emission. For questions of 'how much' or 'how pure', one must know the absolute intensities of the major radiations. We are using liquid scintillation counting (LSC) to measurements of disintegration rates, coupled with {gamma}-ray ...
An absolute spectroradiometric scale has been developed based on an electrically calibrated absolute detector and silicon detector-interference filter combination. Using the recently adopted definition of the photometric base unit, the candela, the absolute spectroradiometric scale was used to realize a photometric scale, i.e., to ...
The hydrogen - hydrogen(deuterium) molecular ion is the most fundamental ion-molecule two-electron system. Charge transfer proceeds through dynamically coupled electronic, vibrational and rotational degress of freedom. Using the ion-atom merged- beams apparatus at Oak Ridge National Lab we have measured absolute charge transfer cross sections for D2^+ + H from keV/u collision ...
Use of cloud radars and radiometers for tropical cyclone intensity estimation Valerie Wong1 2007. [1] Tropical cyclone intensity is shown to be proportional to the difference between the moist the absolute temperatures of the boundary layer and of the storm top. Measurements of the radial gradient
E-print Network
Three different intensity monitors were tested in the external proton beam at LAMPF, and together cover the entire range of beam currents available. A 800 kg Faraday cup was installed and used to measure the absolute intensity to better than 1 percent for...
A net spectral intensity signal is derived from a comparison between the absolute spectral intensity of the signal interest and the intensity of a spectral continuum on which it rides. To derive the net signal, a pivotal refractor plate is mounted over th...
This paper deals with the development of empirical relationships for the estimation of Arias Intensity and Cumulative Absolute Velocity as a function of Housner Intensity. These ground motion parameters are evaluated for a data set of natural accelerograms previously used in the calibration of attenuation equations in Europe and the ...
A low-pressure hydrogen discharge lamp was calibrated for radiant intensity in the vacuum ultraviolet spectral region on an absolute basis and was employed as a laboratory standard source in spectrograph calibrations. This calibration was accomplished thr...
Aims:We seek to study excitation mechanisms in the inner region of the Orion Molecular Cloud by comparing observations of ortho- and para-lines of H2 with theoretical models of slow shocks and photodissociation regions. Methods: K-band observations of H2 obtained with the Canada-France-Hawaii 3.6 m telescope using the PUEO adaptive optics system are reported. Data were centered on the ...
The absolute intensities of 36 ?-rays in the energy range of 292-8579 keV from neutron capture in chlorine were remeasured at the Budapest cold neutron prompt gamma activation analysis facility. The 1% level of accuracy of the nitrogen standard was practically achieved for the relative intensity of most of the 36Cl ?-rays, thus making ...
In this paper we report absolute intensities of vacuum ultraviolet and near ultraviolet emission lines (4.8 eV to 18 eV) for aluminum etching discharges in an inductively coupled plasma reactor. We report line intensities as a function of wafer type, pres...
A method of absolute intensity measurement of intensive impulse fluxes has been described. Method and primary absolute detector device - photoionization quantometer - are based on fundamental cross sections of photoionization and ionization by electron impact. New soft X-ray optic elements - multilayer mirrors ...
... of the 5106 Angstrom Copper Atomic Spectral Line in the AFFDL Rent Facility. Descriptive Note : Interim technical rept. Dec 72-Feb 73,. ...
... 3, 1 Dec 63-30 Nov 64,. ... describes the techniques being adopted in the measurement of absolute line intensities for neutral atoms of iron, lead, and ...
A theoretical analysis of the line centers and absolute line intensities of the ?2 vibrational band of HTO species is made. Rotational constants and transformed dipole moment parameters for this band are obtained.
... Using this instrument, data have been obtained of the absolute spectral radia- tion intensity of air, nitrogen, neon, and argon heated by reflected ...
... glaze, precipitation of a certain intensity, absolute dry weather, snowfall, ... and annual tabular summaries, and the 19th century for weather maps. ...
Abstract: The Auroral Meridian Scanning Photometer is to measure the absolute intensity of aurora brightness along the geomagnetic meridian line. ...
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A solenoid comprising several, discrete, coaxial, circular, superconducting coils provides a magnetic field which decreases radially to an absolute minimum intensity to focus the ions as they are accelerated to the end of the non-relativistic velocity ran...
certain intensity, absolute dry weather, snowfall, snow cover, hail, sleet, thunderstorms, and precipitation periods. Monthly variables ...
The spectral distribution and absolute intensity of the collision-induced Raman spectrum of He is measured and compared to wave mechanical calculations. (AIP)
The nonlinear saturation of the absolute stimulated Raman scattering (SRS) instability is considered in a finite homogeneous plasma. The amplitude of the incident wave exceeds the absolute instability threshold by the fractional amount (<<1). A single backscattered wave and a single plasma wave grow until time-asymptotic saturation occurs. The ...
... Relative crystal-structure factors and relative atomic form factors were calculated from the intensities; absolute atomic form factors and characteristic ...
Status of the H-jet polarimeter development is reviewed. The preliminary results of atomic beam intensity and density measurements are presented.
... found between the 9esults obtained by Snyder and Hisatsu ... A4 as tOe geometric lengt of the absorbing ... The slit function gives the, fraction of energy ...
... program to measure absolute directional intensities of cosmic ray muons from ... theoretical calculations of processes which give rise to the muon flux. ...
of falling out of synchronization. Thus it is absolutely necessary that power be regulated as a function of wind intensity. Such a regulation cannot be per- ...
Quantum gas of ground-state polar molecules opens the door to a wide range of scientific explorations. Novel molecular interactions, chemical reactions in the quantum regime, exotic quantum phase transitions, and strongly correlated states of matter are among a few prominent examples to be studied. We present recent experimental progresses at JILA, including the production of a high phase-space ...
Cold, neutral hydroxyl radicals are Stark decelerated and efficiently loaded into a permanent magnetic trap. The OH molecules are trapped in the rovibrational ground state at a density of �106cm-3 and temperature of 70 mK. Collision studies between the trapped OH sample and supersonic beams of atomic He and molecular D2 determine absolute collision cross ...
Ultracold LiCs molecules in the absolute ground state X1Sigma+, v'' = 0, J'' = 0 are formed via a single photoassociation step starting from laser-cooled atoms. The selective production of v'' = 0, J'' = 2 molecules with a 50-fold higher rate is also demonstrated. The rotational and vibrational state of the ground state molecules is determined in a setup combining depletion ...
Photofragment spectroscopy is applied to investigate perturbations in the photoexcitation and predissociation of excited singlet states of N2. Discrete rovibrational levels in the Rydberg states c' 1?u+ (v=3 and 4) and c 1?u (v=3 and 4) and in the valence state b' 1?u+ (v=10, 12, 13, and 15) are prepared by laser excitation from the metastable a'' 1?g+ (v=0) state in a fast (3 ...
Studies of the higher Rydberg states of NO[sub 2] have been restricted due to the poor Franck-Condon overlap between the ground state of the bent neutral molecule and the linear ion. A knowledge of these states is required so as to better understand the dynamics of the intermolecular relaxation in the system. The research in this thesis has overcome the Franck-Condon barrier through the use of ...
The absorption spectrum of HDO has been recorded by intracavity laser absorption spectroscopy in the 16 540-17 055 cm(-1) spectral region corresponding to the 5nu(3) band centered at 16 920 cm(-1). The (0 0 5) vibrational state is found to be mostly isolated from the nearby rovibrational states. The corresponding rovibrational transitions were analyzed and ...
In this paper we present high-resolution 4.7 {mu}m spectra of the isolated Herbig Be star HD 100546. HD 100546 has been the subject of intense scrutiny because it is a young nearby star with a transitional disk. We observe the {delta}v = 1 rovibrational CO transitions in order to clarify the distribution of warm gas in the inner disk. Modeling of the CO ...
The rovibrational state distributions and state-resolved scattering distributions of CD(3) radicals produced by the reaction O((1)D) + CD(4) were investigated by crossed molecular beam ion imaging. The rotational structure of the resonance-enhanced multiphoton ionization spectrum of CD(3) in the ground vibrational state indicates that the low K rotational states of CD(3) ...
Ultracold molecular gases can provide new insights into fundamental physics and lead to exciting applications. Dense samples of polar molecules in the ground rovibrational state v=0, J=0 are required for many of these studies. We discuss several coherent techniques, based on Stimulated Raman Adiabatic Passage (STIRAP), to produce molecular gases in v=0, J=0 state starting from ...
The solvation dynamics of ionic liquids have been the subject of intense experimental study but remain poorly understood. We present the results of molecular dynamics simulations of the solvation dynamics of the ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate in response to photoexcitation of the fluorescent dye coumarin-153. We reproduce the time-resolved ...
The study aimed to explore how sensations of warmth depend on the intensity and spatial extent of skin heating. Near the absolute threshold for warmth, intensity and extent of stimulation trade approximately equally; i.e., when areal extent is doubled, so...
The half life, the line width, and the ratio of peak intensities of the R sub 1 and R sub 2 ruby lines are only a function of temperature, while the shift in line position and the absolute intensities are functions of both the pressure and temperature. Th...
A group of tables is presented listing accurate theoretical line positions and absolute emission intensities for individual multiplet-vibration-rotation transitions in the ground state of nitric oxide. The data covers both intramultiplet and intermultiple...
Data are presented on the energy spectrum and absolute intensity of solar cosmic ray protons in cosmic ray flares recorded on Nov. 14, 15, and 21, 1960. About seventy measurements were made in the stratosphere at various latitudes. (W.D.M.)
A high-resolution Fourier transform infrared spectrum of methyleneimine has been obtained in the gas phase in the 700-1300/cm region. The rovibrational intensity patterns, which are sensitive to the Coriolis interactions, are simulated, and the results are used to reduce relative signs and magnitudes of the vibrational transition moments. The spectrum is ...
We report the first experimental observation of homonuclear propensity in collisional relaxation of a polyatomic molecule. A pump-probe stimulated Raman setup is used to pump population to a single rotational level of the v(2) = 1 vibrationally excited state in (13)C(12)CD(2) and then monitor the redistribution of the rotational population that has taken place after a fixed delay. The Q-branch of ...
We report the first experimental observation of homonuclear propensity in collisional relaxation of a polyatomic molecule. A pump-probe stimulated Raman setup is used to pump population to a single rotational level of the v2 = 1 vibrationally excited state in 13C12CD2 and then monitor the redistribution of the rotational population that has taken place after a fixed delay. The Q-branch of the ...
Relative intensities for K x-rays and gamma rays emanating from /sup 99/Mo in equilibrium with its /sup 99/Tc* daughter have been measured using several Ge photon detectors. Combining these intensities with an evaluated set of electron-conversion coefficients has provided a set of absolute intensities for the ...
DOE Information Bridge
The relative intensities of 27 optical transitions in the Eu II spectrum are measured, and the excited state lifetimes absolute oscillator strengths are computed. A grating monochromator is used to observe selectively the emitted lines in the wavelength region from 350-750 nm, and a tungsten ribbon lamp is used for the calibration of the spectral ...
The acquisition of auditory intensity discriminations in rats trained on multiple variable-interval extinction schedules was studied as a function of some of the variables that contribute to the speed of development of differential responding and the final level attained. The effects of three variables were isolated and studied in detail: (1) the decibel difference between the ...
PubMed Central
A qualitative investigation was made on the detection of the pulsation of the integral intensity of the spectral lines for plasmatrons with fixed arc length. It was found that the pulsation of the intensity of the spectral lines is caused by the pulsation of the temperature at each point of the plasma. It was assumed that the pulsation of the ...
The absolute intensity of a Ra-Be neutron source was measured. The source contains 500 milligrams of radium plus 5 grams beryllium and produces (5.85 plus or minus 0.76 x 16/sup 6/ neutrons/sec. The experimental procedures are described and the result discussed and compared with those of similar determinations. (auth)
Current interest in an absolute measurement of the vertical intensity of muons stimulated the present research. A novel method for ihe classification of events, and in particular the separation of muons from the soft component, has enabled the determination of a set of relatively precise and reliable measurements. The results so obtained are ...
The absolute intensity of radiation emitted by fissioning and nonfissioning uranium plasmas in the spectral range from 350 nm to 1000 nm was measured. The plasma was produced in a plasma-focus apparatus and the plasma properties are simular to those anticipated for plasma-core nuclear reactors. The results are expected to contribute to the establishment of ...
We report the creation and characterization of a near quantum-degenerate gas of polar 40K-87Rb molecules in their absolute rovibrational ground state. Starting from weakly bound heteronuclear KRb Feshbach molecules, we implement precise control of the molecular electronic, vibrational, and rotational degrees of freedom with phase-coherent laser fields. In ...
This thesis consists of two experimental applications of the Autler-Townes (AT) spectroscopy. In the first experiment, we have determined the electronic transition dipole moment for the 7Li2 A1Sigmau+ - X 1Sigmag+ system experimentally by using a 4-level continuous wave extended ? excitation scheme and compared our results with theoretical predictions. 7Li 2 is a good test case for the accuracy of ...
We report a comparison between experimental and theoretical electronic transition dipole moment values for the 7Li2 A 1?u+-X 1?g+ system. The experimental results are based on measuring the absolute magnitude of the transition dipole matrix elements from Autler-Townes splitting of rovibrational transitions for different R-centroid values. The ab initio ...
We report a comparison between experimental and theoretical electronic transition dipole moment values for the (7)Li(2) A (1)Sigma(u) (+)-X (1)Sigma(g) (+) system. The experimental results are based on measuring the absolute magnitude of the transition dipole matrix elements from Autler-Townes splitting of rovibrational transitions for different R-centroid ...
The absolute intensities of {gamma} rays produced in the decay of {sup 182}Hf were determined by measuring its {gamma}-ray spectra with high-resolution Ge spectrometers. Because the sample was chemically purified more than 30 years ago, the daughter {sup 182}Ta (t{sub 1/2}=114.43 d) was in secular equilibrium with {sup 182}Hf (t{sub 1/2}=8.90x10{sup 6} ...
The Fourier transform infrared (FTIR) absorption spectrum of the ?12 fundamental band of ethylene-d4 (C2D4) was recorded in the 1017-1137 cm-1 region with an unapodized resolution of 0.0063 cm-1. Upper state (v12 = 1) rovibrational constants consisting of three rotational and five quartic constants were improved by assigning and fitting 2103 infrared transitions using ...
We report a full-dimensional study of the classical dynamics of HCN{yields}HNC isomerization and of HCN rovibrational dissociation driven by a strong but nonionizing picosecond infrared laser field. The dynamics of the isolated molecule and of the molecule in liquid Ar have both been studied. Our theoretical and numerical results show that when all degrees of freedom are ...
The absorption spectrum of nitrous oxide, N2O, in normal isotopic abundance has been recorded by CW-Cavity Ring Down Spectroscopy between 7647 and 7918 cm?1. The spectra were obtained at Doppler limited resolution by using a CW-CRDS spectrometer based on a series of fibered DFB lasers. The typical noise equivalent absorption on the order of ?min ? 1 � 10?10 cm?1, allowed for the detection of ...
The experimental procedure of Yoshino and Bernstein for the measurement of Raman intensities of gases has been simplified and the apparatus adapted to the investigation of the spectra of vapors. For absolute intensities the pure rotation line J = 1 --> 3 of hydrogen was used as an internal standard as suggested by Golden and ...
... plane. The experiment implies long plasma exposure times and therefore a possibility of hydrogenation of the surface. ...
MOLECULAR PHYSICS, 1999, VOL. 96, NO. 9, 1305� 1315 The rovibrational kinetic energy for complexes) The rovibrational kinetic energy for an arbitrary number of rigid molecules is computed. The result has the same general form as the kinetic energy in the molecular rovibrational Hamiltonian, although certain quantities
Stock solutions of (233)Th were produced by the (232)Th(n,gamma) reaction and multiple purifications were used to obtain relative intensities of weak transitions. Liquid scintillation counting (absolute disintegration rates) and gamma-ray spectroscopy with HPGe detectors yielded absolute photon intensities. ...
The 2nu1 + nu2 + 3nu3 band of ozone, which occurs in the 5700-cm-1 region, has been observed for the first time using a Fourier Transform Spectrometer, operating at 0.008 cm-1 resolution and with a large pathlength x pressure product (3216 cm x 28.3 Torr). The assignment of rotation-vibration transitions has been done for J up to 38 and Ka up to 11, respectively, after many difficulties due to a ...
This paper continues the analysis of the integrated intensities of substituted benzenes. In particular, the absolute integrated vibrational intensities of bromobenzene-d5 are presented. The previously reported imaginary molar polarizability spectrum of bromobenzene-d5 was fitted with 231 CDHO bands. The majority of the bands are ...
Absolute calibration of small-angle scattering (SAS) intensity data (measured in terms of the differential scattering cross section per unit sample volume per unit solid angle) is essential for many important aspects of quantitative SAS analysis, such as obtaining the number density, volume fraction, and specific surface area of the scatterers. It also ...
Absolute intensities have been measured for 26 lines of C2H4 in the nu7 fundamental transition, using a tunable diode-laser spectrometer. These lines with 3< or = J"< or = 21, 2< or = Ka< or = 4, 2< or = Kc< or = 20 are located in the spectral range 920-980 cm(-1). The intensities have been measured by using two ...
We have analyzed the high-resolution ultraviolet (UV) emission spectrum of molecular deuterium hydride (HD) excited by electron impact at 100 eV under optically thin, single-scattering experimental conditions. The high-resolution spectrum (FWHM=160 m�) spans the wavelength range from 900 to 1650 � and contains the two Rydberg series of HD: 1?+u1s?, np?(B, B', B'', n=2, 3, 4)-->X 1?+g and ...
We outline design considerations and operating characteristics of the Los Alamos Fourier-transform spectrometer, a state-of-the-art instrument operating from 200 nm to 20 ..mu..m with a resolution of 0.0026 cm/sup /minus/1/ and very high wave number and intensity accuracy. Recent work in molecular spectroscopy carried out with this instrument will be discussed, including N/sub ...
The prototypical Seyfert type 2 galaxy NGC 1068 has been observed with the LWS (Long Wavelength Spectrometer) on board the ISO (Infrared Space Observatory, ESA) satellite from 43 to 197?m. All the expected ionic fine structure lines have been detected. Also present are OH rotational lines in emission, at 79, 119 and 163 ?m. The ionic line intensities and ratios in NGC 1068 are ...
Optically pumped laser emission has been observed on the NaK 2(A) 1 Sigma (+) to 1 (X) 1 Sigma (+) electronic state transition. The emission occurs between 1.015 and 1.035 microns when a sodium-potassium heat-pipe oven is pumped with 695-745nm pulsed dye laser radiation. The laser emission occurs on many ro-vibrational transitions without the use of cavity mirrors. However, ...
Helium nanodroplets provide a gentle matrix in which to isolate reactive species for spectroscopic investigations. In our ongoing effort to generate radical species in helium nanodroplets, we have recently focused our attention on the highly reactive hydrogen peroxide (H_2O_2) molecule, a potential precursor for the hydroxyl radical. The infrared spectrum of hydrogen peroxide was measured in ...
The absorption spectrum of water vapor has been investigated by Intracavity Laser Absorption Spectroscopy (ICLAS) between 13 540 and 14 070 cm?1. This spectrum is dominated by relatively strong transitions of the 4? polyad of vibrational states. The achieved sensitivity � on the order of ?min � 10?9 cm?1 � has allowed one to newly measure 222 very weak transitions with ...
Room temperature spectra of carbon dioxide were obtained with the Fourier transform spectrometers at the National Solar Observatory's McMath-Pierce telescope and at the Jet Propulsion Laboratory. The multispectrum nonlinear least squares fitting technique is being used to derive accurate spectral line parameters for the strongest CO_2 bands in the 4700-4930 cm^{-1} spectral region. Positions of ...
Tunable diode laser absorption measurements at high pressures by use of wavelength-modulation spectroscopy (WMS) require large modulation depths for optimum detection of molecular absorption spectra blended by collisional broadening or dense spacing of the rovibrational transitions. Diode lasers have a large and nonlinear intensity modulation when the ...
We constructed an ionization chamber (IC) to test the absolute intensity of the BEPC-LINAC (Beijing Electron Positron Collider-Linear Accelerator) test beam. The IC was adapted for the 1.89 GeV high-energy electron beam, with pulse time width of 1.2 ns and frequency of 25 Hz, by equipping it with a double-mode readout and choosing the optimum circuit ...
The absolute spectrophotometry of comet OkazakiLevyRudenko in the near-infrared region is carried out. The number of CN molecules is estimated to be (1.03 0.24) 1031 from the absolute intensities of the (2, 0), (3, 1), and (4, 2) emission bands of the CN red system. The intensity ratio of the (3, 1) and (2, 0) CN ...
The recent formation of ultracold KRb molecules in their absolute rovibrational ground state [1] has created great promise for study of collective phenomena that rely on the long-range interactions between polar molecules. Here we discuss the theoretical analysis of various essential properties of the KRb molecules [2] that accompanied these experimental ...
Crossed molecular beams have been used to study rotationally and vibrationally inelastic scattering from the (7/sup 2/, K' = 0) and the (0/sup 0/, K' = 0) levels of /sup 1/A/sub u/ (S/sub 1/) trans-glyoxal in collision with H/sub 2/. The center-of-mass collision energy was approximately 80 meV (650 cm/sup -1/). Laser excitation was used to select each of the initial vibrational ...
A scale factor gamma, to convert from the relative to the absolute/relative intensity scale, is readily calculated during computer simulation of powder patterns. Previously used scale factors are related to gamma. The Reference Intensity Ratio, I/I sub c ...
The intensity and spectrum of neutrons leaking out of the earth's atmosphere are calculated by a multigroup diffusion code as a function of latitude and solar cycle. The absolute intensity is obtained from normalization of the calculated flux to measured values in the atmosphere. The calculated neutron leakage ...
-nuclear coupling of B appear to be relatively unperturbed from that of BChl itself. For example, the Raman spectrum in a resonance Raman spectrum are those that couple to the resonant electronic transition, and the intensity of the absorption spectrum and Raman excitation profiles. We found previously that the absolute intensity
An activation technique using coincidences between characteristic X-rays and ?-rays to obtain absolute cross-sections is described. This method is particularly useful in the case of nuclei that decay by electron capture. In addition to the reduction of possible contamination, an improved detection sensitivity is achieved as compared to inclusive measurements, thereby allowing ...
Using the Doppler-free, perturbation-facilitated optical-optical double resonance technique, we have investigated the vibrational, rotational, and hyperfine structure of the NaK 33pi double minimum state and 43pi V-shaped potential. The double minimum and V-shaped character of these two potential wells arise from an avoided curve crossing. As a result, the NaK 33pi state exhibits strikingly ...
Measuring the angular distributions and the absolute intensities of the L x-ray lines of gold at 2.4-18.2 MeV nitrogen ion impact, the absolute subshell ionization cross-sections and the alignment parameter of the L/sub 3/-subshell have been determined and compared to the theoretical results.
) Preparative intensive course for absolute beginners (A1) When: 14 � 18 February 2011 Where: USI Lugano, Main SEMESTER 2011: 2) Absolute Beginners (A1) When: 21 February - 30 May 2011 (Spring Semester) Where: USI expressions related to everyday life. Lecturer: Stefania Benedetti Application: fill in the form 3) Beginners
) Preparative intensive course for absolute beginners When: 8 � 12 February 2010 Where: USI Lugano, Main THE SPRING SEMESTER 2010: 2) Absolute Beginners (A1) When: 15 February - 17 May 2010 (Spring Semester) Where expressions related to everyday life. Lecturer: Stefania Benedetti Application: fill in the form 3) Beginners
We propose and demonstrate experimentally a new method based on the spatial entanglement for the absolute calibration of analog detectors. The idea consists on measuring the sub-shot-noise intensity correlation between two branches of parametric down conversion, containing many pairwise correlated spatial modes. We calibrate a scientific CCD camera and a ...
By analyzing the pulse to pulse intensity fluctuations of the radiation emitted by a charge particle in the incoherent part of the spectrum, it is possible to extract information about the spatial distribution of the beam. At the Advanced Light Source (ALS) of the Lawrence Berkeley National Laboratory, we have developed and successfully tested a simple scheme based on this ...
By analyzing the pulse to pulse intensity fluctuations of the radiation emitted by a charge particle in the incoherent part of the spectrum, it is possible to extract information about the spatial distribution of the beam. At the Advanced Light Source (ALS) of the Lawrence Berkeley National Laboratory, we have developed and tested a simple scheme based on this principle that ...
