... Statistical band model calculations are performed for the assumption that the emission-absorption lines have a Lorentz, Doppler, or Voigt profile. ...
DTIC Science & Technology
An investigation was conducted to explore the use of infrared and ultraviolet emission-absorption spectroscopy for determination of temperature profiles in flames. Spectral radiances and absorptances were measured in the 2.7-micron H2O band and the 3064-A...
National Technical Information Service (NTIS)
The authors improved the accuracy of the method of universal functions (MUF) for estimating total band absorptances and their derivatives for nonoverlapping Lorentz-profile lines of vibration-rotation bands for linear molecules and symmetric tops. The MUF accuracy is estimated for the CO2 ?2- and ?3-fundamental ...
NASA Astrophysics Data System (ADS)
A theoretical study of rotational profiles of molecular absorption bands is essential for direct comparison with observations of diffuse interstellar bands. Applications using a Gaussian quantum-chemical approach within density functional theory are presented. Structural and vibrational properties of the polycyclic ...
A theoretical study of rotational profiles of molecular absorption bands is essential for direct comparison with observations of diffuse interstellar bands. Applications using gaussian quantum-chemical approach within DFT are presented. Structural and vibrational properties of the polycyclic aromatic hydrocarbon ...
Energy Citations Database
We measured the Soret band of deoxymyoglobin (deoxyMb), myoglobin cyanide (MbCN), and aquo-metmyoglobin (all from horse heart) with absorption and circular dichroism (CD) spectroscopies. A clear non-coincidence was observed between the absorption and CD profiles of deoxyMb and MbCN, with the CD ...
Recently a weak, diffuse interstellar band (DIB) at 5069 �/ was claimed to coincide in wavelength and width with the A ^2?u - X ^2?g gas-phase origin absorption band of HC_4H^+. Laboratory rotational profiles recorded at low temperatures are presented and a comparison with astronomical data is done based on ...
... Accession Number : AD0648884. Title : THE INTENSITY OF THE ABSORPTION BANDS OF RUBY,. Corporate Author : FOREIGN ...
Although visible and near IR reflectance spectra contain absorption bands that are characteristic of
NASA Technical Reports Server (NTRS)
The resonance Raman excitation profiles of a number of charge transfer transitions in electron donor/acceptor complexes with tetracyanoethylene as acceptor in solution at room temperature are reported and compared with absorption and fluorescence spectra of these complexes. All complexes show distinct anomalies which cannot be accounted for by existing ...
PubMed Central
Multiphoton absorption of 2,5-bis[4-(2-N,N-diphenylaminostyryl)phenyl]-1,3,4-oxadiazole was experimentally studied by using femtosecond laser pulses. This material demonstrates a very broad multiphoton absorption band of around 300 nm width with two peaks of 1250 and 1475 nm. The first peak results from the three-photon ...
New laboratory data are presented for the previously reported molecular absorption band at 4429 � observed in a benzene plasma matching the strongest diffuse interstellar band (DIB) at 4428.9 �. Gas-phase absorption spectra are presented for rotational temperatures of ~15 and 200 K. The observations indicate ...
The ultraviolet absorption spectra of 22 different chemical (structural) groups of drugs and toxic compounds were studied. This paper completes a three-part series in which more than 500 individual compounds have been grouped according to structure as it pertains to characteristics of the ultraviolet absorption scan. Each group has a typical ...
PubMed
G. P., S. A. Clough,. F. X. Kneizys,. J. H. Chetwynd, and E. P. Shuttle,. 1986: AFGL atmospheric constituent profiles. (0-120 km), AFGL-TR-86-0110, ...
NASA Website
Enhancement spectra of the collision-induced absorption (CIA) in the first overtone region 5000-7000 cm?1 of D2 in D2-N2 were studied at 298 K for a base density of D2 of 73 amagat and for partial densities of N2 in the range 150-370 amagat. The observed spectra were modeled with a total of 1176 components of double vibrational transitions. Binary and ternary ...
The effect of a strong electric field on the charge-transfer optical absorption is studied in linear narrow-band Mott-Hubbard insulators (or semiconductors) such as alkali-TCNQ's (tetracyanoquinodimethanes) and antiferromagnetic Heisenberg chains, using the half-filled-band Hubbard model with strong on-site Coulomb repulsion. ...
The probe absorption-dispersion spectra of a radio-frequency (RF)-driven five-level atom embedded in a photonic crystal are investigated by considering the isotropic double-band photonic-band-gap (PBG) reservoir. In the model used, the two transitions are, respectively, coupled by the upper and lower bands in such ...
Enhancement spectra of the collision-induced absorption (CIA) of H2 in its first overtone region 7500 9500cm in binary mixtures H2 N2 and H2 CO were studied at 298 K for base densities of H2 in the range 89 145 amagat and for partial densities of N2 and CO in the range 19 392 amagat. The observed spectra confirm that the isotropic overlap induction is absent in the 2 0 ...
Two satellite-borne ocean-color sensors scheduled for launch in the mid 1990's each have a spectral band (nominally 745-785 nm) that completely encompasses the O(2) A band at 762 nm. These spectral bands are to be used in atmospheric correction of the color imagery by assessment of the aerosol contribution to the total radiance at the ...
The behavior of IR absorption bands with temperature has been examined systematically in the laboratory for three representative polycyclic aromatic hydrocarbon molecules: coronene, chrysene, and 1-methylcoronene. A careful description of both intensity and profile measured for most of the bands is reported. A ...
... Accession Number : AD0465062. Title : NEAR INFRARED ABSORPTION BAND IN CADMIUM SULFIDE SINGLE CRYSTALS,. ...
The infrared emission bands (also known as the UIR bands.) have recently been observed in absorption
Forbidden absorption bands of diatomic O in Ar continuum region, determining rotational constants of
... Accession Number : AD0739310. Title : Concerning the Optical Absorption Band of the Hydrated Electron,. Corporate Author ...
... Accession Number : AD0615684. Title : APPROXIMATIVE BAND ABSORPTION AND TOTAL EMISSIVITY CALCULATIONS FOR H2O,. ...
... Accession Number : AD0612573. Title : APPROXIMATE BAND ABSORPTION AND TOTAL EMISSIVITY CALCULATIONS FOR CO2,. ...
... Title : A Broad Band Radiation Source for Optical Absorption Spectroscopy Measurements in Single Shot Transient Media. ...
Pulsed photothermal radiometry can be used for non-invasive depth profiling of optically scattering samples, including biological tissues such as human skin. Computational reconstruction of the laser-induced temperature profile from recorded radiometric signals is sensitive to the value of the tissue absorption coefficient in the ...
Kre?owski et al. have reported a weak, diffuse interstellar band (DIB) at 5069 � which appears to match in both mid-wavelength and width the A 2?u-X 2?g gas-phase origin absorption band of HC4H+. Here, we present laboratory rotational profiles at low temperatures which are then compared with the 5069 � DIB ...
... A 575-millimicron band was detected in the absorption spectrum and a 600-millimicron band in the reflection spectrum. ...
The present of gas phase methanol in dense interstellar molecular clouds was established by radio detection of its rotational emission lines. However, the position, width, and profile of a absorption band near 1470 cm-1 in the IR spectra of many dense molecular clouds strongly suggests that solid methanol is an important component of ...
... Accession Number : ADD851838. Title : INFRARED ABSORPTION IN PHOSPHORUS DOPED SILICON AND THE D- BAND. ...
Collision induced absorption (CIA) spectra of pure D2 in the first overtone region from 5250 to 7250 cm^{-1}, recorded at 77, 201 and 298 K, have been analyzed. The observed spectra at 77, 201 and 298 K were modelled by a total of 92, 214 and 267 components respectively of double vibrational transitions at room temperature of the type X2(J)+X0(J) and X1(J)+X1(J), where X is O, ...
Dimethylamino-substituted triphenylphosphines show a dual fluorescence in polar solvents. The strong red-shift of the new fluorescence band in solvents of increasing polarity indicates emission from a species of charge transfer character, by analogy with dimethylaminobenzonitrile. In this study, we give evidence for the fast formation of a polar transient species in the first ...
... the parallel band and the perpendicular band. Bands of both the isotopic ... INFRARED SPECTROSCOPY, VIBRATION, ROTATION, MOLECULAR ...
... PHOTOELECTRIC EMISSION, VALENCE, CONDUCTION BANDS, X RAY SPECTROSCOPY, BAND SPECTRA, X RAY ABSORPTION ANALYSIS, ...
Experimental observations of propane-air flames were performed. Measurements of hydroxyl (OH) radical concentration were made using resonance line absorption techniques. A microwave-pumped low pressure discharge in argon and water vapor is employed to produce strong OH radical band radiation in the 308 nm region. This radiation is transmitted through the ...
A model is derived for the resonance absorption of molecular bands composed of Lorentzian lines is suitable for calculating fluorescence from irradiated air. The model is based on an explicit functional form derived for the resonance absorption of a singl...
The first detection of the silicate absorption feature in Active Galactic Nuclei (AGNs) was made at 9.7?m for the prototypical Seyfert 2 galaxy NGC1068 35 yr ago, indicating the presence of a large column of silicate dust in the line of sight to the nucleus. It is now well recognized that type 2 AGNs exhibit prominent silicate absorption ...
The possibility of a simple single-shot oxygen monitor for a float-glass plant by use of the Schumann-Runge absorption lines within the broadband lasing structure of an ArF excimer laser initiated this detailed study. We present the theoretical predictions and the experimental absorption profiles at temperatures from 76 to 2000 degree ...
In photoacoustic imaging, the difference of optical absorption determines the contrast between two media. In this study, a contrast enhancement method based on choosing various frequency subbands for photoacoustic imaging is proposed. Typically, a laser beam irradiates a medium of interest, and the optical energy decays with different rates as the optical ...
Circumstellar disks and envelopes of low-mass YSOs contain significant amounts of ice. Such icy material will evolve to volatile components of planetary systems, such as comets in our solar system. In order to investigate the composition and evolution of circumstellar ice around low-mass YSOs, we have observed ice absorption bands towards eight YSOs ...
An experimental and theoretical investigation of basic plasma-physics processes relating to the absorption of electromagnetic waves in collisional plasmas is described. One-way absorption of 63 dB at 4 GHz was demonstrated in a section of plasma-loaded rectangular C-band waveguide. The ultraviolet photoionization plasma-production ...
absorption features of hydrous minerals: alunite in band 5 , sericite/ montmorillonite in band 6, kaolinite in bands 5 and 6 , and chlorite in band 7, ...
The (0,0) Swan band of the C{sub 2} molecules in a laser ablation plume produced on the surface of graphite target submerged in water was used as a probe to estimate the density of C{sub 2} molecules in the plume. Observed emission spectra were reproduced excellently by introducing a self-absorption parameter to the theoretical spectral ...
Vibrational reporters have shown significant promise as sensitive probes of local environments in proteins and nucleic acids. The utility of two potential vibrational probes, the cyanate and azide groups in phenyl cyanate and 3-azidopyridine, respectively, has been hindered by accidental Fermi resonance. Anharmonic coupling, between the fundamental -OCN or -N(3) asymmetric stretch vibration with a ...
... Title : Optical Absorption Depth Profiling of Photodegraded Poly (Vinylchloride) (PVC) Films by Quantitative Photothermal Deflection Technique,. ...
... Title : ULTRASONIC ABSORPTION SPECTROSCOPY IN FLUIDS BY OPTICAL DETECTION OF PHOTOACOUSTIC PULSE PROFILES. ...
... Title : EFFECT OF VOLUMETRIC ABSORPTION COEFFICIENT ON ... Abstract : In calculating the temperature profile and heat transfer ...
The collision-induced infrared absorption spectra of the fundamental band of HD in binary mixtures of HD with Ne and Ar at room temperature have been studied with an absorption path length of 105.2 cm for different base densities of HD in the range 8--20 amagat and a number of total gas densities up to 175 amagat. The observed features ...
The exciton binding energy (Eb) and the band gap energy (Eg) of poly(phenylene vinylene) are determined by high-resolution measurements of the photoconductivity excitation profile as a function of light polarization, applied electric field, and temperature. At high applied electric fields, a peak in the ...
A theoretical framework is developed for the emission line shape of the single complex spectroscopy (SCS). The quantum mechanical characteristics of the single complex emission line shapes for the model B850 band of the light harvesting complex 2 of purple bacteria are studied including both static and quasi-static disorders within the exciton Hamiltonian. The bath is modeled ...
In this report the fluxes measured by the solar flux radiometer (LSFR) of the Pioneer Venus large probe are compared with calculations for model atmospheres. If the large particles of the middle and lower clouds are assumed to be sulfur, strong, short-wavelength absorption results in a net flux profile significantly different from the LSFR net flux ...
Fourteen bands of ozone between 500 and 3300 per cm have been identified and values of the vibrational anharmonic constants determined. The integrated band absorptances of many of these bands have been measured from spectra of a 32 m path of ozone-oxygen ...
The velocity profile of O2(b 1?g+,v=0) produced by photolysis of O3 in the Huggins band region at 351.4 nm has been measured using a delayed pulsed field extraction time-of-flight technique confirming that this fragment is formed by single-photon absorption. The velocity profile of O(3P0) produced by photolysis at ...
A vector radiative transfer model was used in conjunction with the line-by-line radiative transfer model and the database of high-resolution transmission (HITRAN) molecular absorption to simulate the degree of linear polarization of skylight in cloud-free conditions. Differences between simulated and measured polarization data in high-spectral resolution are found to be within ...
In this study a simple route to preparing photochromic silver nanoparticles in a TiO{sub 2} matrix is presented, which is based upon sputtering and subsequent annealing. The formation of silver nanoparticles with sizes of some tens of nanometers is confirmed by x-ray diffraction and transmission electron microscopy. The inhomogeneously broadened particle-plasmon resonance of the nanoparticle ...
The optical gain and transient absorption spectra for the IF 490-nm and ICl 430-nm bands have been measured in discharge-excited He, CF/sub 3/I and NF/sub 3/ or CCl/sub 4/ gas mixtures using a flashlamp---pumped, tunable dye laser. For the IF blue-green band, gain in excess of 1.0% cm/sup -1/ was observed over the entire 479--498-nm ...
We have investigated the mechanism of enhanced absorption intensities of vibrational bands of adsorbates on copper meshes with subwavelength holes by measuring and simulating temporal profiles of infrared pulses transmitted through the meshes. As reported previously [Williams et al., J. Phys. Chem. B, 2003, 107, 11871], the ...
Forbidden absorption bands of carbon monoxide in vacuum UV region, noting rotational and vibrational
absorption bands, and we nd that the Goody random band model and the Lacis Hansen empirical parameterization produce comparable tropospheric ...
Absorption Bands and Atmospheric Windows ... by atmospheric gases such as water vapor, carbon dioxide, and ozone are known as absorption bands. In the ...
... Accession Number : AD0749879. Title : Infrared Absorption Bands of Nitrous Oxide. Descriptive Note : Final rept. 15 May 69-14 Jul 72,. ...
... INFRARED ABSORPTION IN HEATED AIR FROM VIBRATION-ROTATION BANDS OF NITRIC OXIDE by ... 52 vibration-rotation bands of nitric oxide. ...
... ABSORPTION OF RADIATION IN THE BANDS OF ATMOSPHERIC HNO SUB 3-ATMOSPHERIC AND OCEANIC PHYSICS, V8, NO2, P133-134. ...
A complete atlas of the 5 nu-1 absorption band of NH3 is presented together with measurements of the
... ADP014981 TITLE: A Broad Band Radiation Source for Optical Absorption Spectroscopy Measurements in Single Shot Transient Media ...
We have investigated the absorption spectra of Tl+ centers doped in ammonium and cesium halides crystals with the CsCl structure up to the vacuum ultraviolet energy range. In the NH4X:Tl+ (X = Cl, Br) crystals, the A, B and C absorption bands due to the intraionic transitions in the Tl+ ion are observed in the energy region below the ...
... Title : The Basic Parameters of Lines and Bands in the Vibrational Spectra of Raman Scattering and Infrared Absorption of Tetramethoxysilane ...
... Abstract : The pure rotational and vibrational-rotational absorption bands for a ... The experimental spectral band intensities and contours ...
... Abstract : The absorption bands situated at 1485 and 1295 Angstroms unequivocally and on some spectra the weak bands at 1505 and 1370 ...
... Descriptors : *EMISSION SPECTRA, *IONS, *SPECTRUM ANALYSIS, MOLECULAR VIBRATION, EXCITATION, SORPTION, BAND THEORY OF ...
... New bands in the spectrum of methylamine and its deuterium derivatives have been found and their absorption cross-section measured. ...
... Accession Number : AD0261240. Title : OPTICAL TRANSITIONS NEAR THE ABSORPTION EDGE IN CDS. I. - BAND STRUCTURE IN CDS. ...
... Title : INVESTIGATION OF THE ABSORPTION SPECTRA OF InSb-InAs SOLID SOLUTIONS WITH A VIEW TO BAND STRUCTURE,. ...
... It was found that the heavy absorption of the silicate base oil obscured absorption bands of all additives tested in it. In the petroleum base oils the ...
... Title : IMPURITY ABSORPTION DUE TO TRANSITIONS TO CONDUCTION BAND EDGE REGION IN PHOSPHORUS-DOPED SILICON. ...
... Title : CERTAIN RESULTS FROM STUDY OF THE ABSORPTION FUNCTIONS OF WATER VAPOR IN THE 114, 138, AND 187 MICRON BANDS ...
UV - visible absorption, steady state and time-resolved fluorescence techniques were used to investigate the aggregation behaviour in Y-type hemicyanine Langmuir - Blodgett (LB) multilayers. Hemicyanine molecules formed H-aggregates in LB films leading to blue shifts of the absorption and fluorescence bands with respect to those of ...
A theoretical fit has been made to our laboratory measurements of the 2-0 collisionally induced H2 absorption band for temperatures of 122 and 273.3 K and at a density of 20 amagats. A Lennard-Jones 6-12 intermolecular potential and a Birnbaum-Cohen line profile have been used. The fit resulted in a chi-square of 0.2%. Line widths have ...
The emission spectrum of the A(1 Sigma u +) - X(1 Sigma g +) band of Na2 has been recorded following excitation by monochromatic radiation in the region of X-A and X-B absorption. The spectral profile has been investigated as a function of excitation wave...
This paper reports on the measurement of the absorption profile of N/sub 2/0 transitions belonging to the v/sub 2/ vibrational band at = 590/cm in order to characterize the gas flow in a pulsed Laval molecular beam. It was found that the shape of the tran...
A method is presented which describes the discrete energy loss undergone by electrons resulting from absorption events. The initial species, the partitioning of energy, the electron-flux spectra, and radiation band profiles resulting from energy degradati...
Sulfur chemistry on Io and the surface chemistry of the icy Galilean satellites are discussed in terms of laboratory chemical findings and spectral investigations. Gaseous, liquid, and solid allotropes of sulfur are described and related to spectral data for Io. Compounds of sulfur identified on Io's surface are given and possible mechanisms for their formation are evalutated. Laboratory studies ...
The gas-phase electronic absorption spectra of the naphthalene (C10H8+) and acenaphthene (C12H10+) cations have been measured in the visible range in a free jet planar expansion in an attempt to collect data in an astrophysically relevant environment. The direct absorption spectra of two out of four bands measured of the gas-phase cold ...
We investigated the line profile of moderately optically thick molecular transitions from collapsing protostellar envelopes. Using the inside-out collapse model, we simulated high angular resolution observations, which can probe the infall motion of the inner region better than low angular resolution observations. The degree of line asymmetry becomes substantially larger as ...
The absorption by oxygen in the region of the O2 A band near 760 nm has been measured in the laboratory under various conditions of pressure (20-200 atm) and temperature (200-300 K) for both pure O2 and O2-N2 mixtures. In order to calculate the contribution of the ``allowed'' A band transitions, Lorentzian profiles ...
In connection with an elaboration of selective pumping techniques for solid-state laser-drivers a stored energy formation in solid state media under absorption of a narrow-band pumping radiation has been considered. The calculations demonstrate the possibility of the inversion profile smoothing in the slab-like Nd- and Yb-doped active ...
... chromium(III) to neodymium(III) in mullite glass-ceramics. ... absorption bands, in addition to the bands due to Nd(III), consist of two bands peaking at ...
... 5-0 band contour and three within the 6-0 contour were selected ... energies selected from across the rotational band contours, increase monotonically ...
The tropospheric mixing ratio profile of ethylene (C2H4) has been retrieved from a high spectral resolution ground-based infrared solar absorption spectrum. The spectrum was recorded during intense fires in New South Wales, Australia on January 1, 2002, and was analyzed with the C2H4 spectral parameters added to the 2000 HITRAN compilation. ...
The absorption spectrum of zinc vapour is measured under various conditions in the 190-224 nm region and the absolute absorption coefficient per pair of atoms is derived. A relatively narrow diffuse band at 200.22 nm (in a vacuum) is observed and its profile is carefully determined for several temperatures. It is ...
Of all the water ice absorption bands seen in the laboratory, the librational band near 12-13 ? m has proven the most difficult to conclusively identify in observational spectra. Cox reported the detection of this band in the IRAS spectrum of the massive protostar AFGL 961 near 13.6 ? m; however, the details of the ...
A model of Venus' atmosphere permittivity profile up to 300 km is developed in this paper for X band. The model includes both the real and imaginary parts of the atmospheric permittivity, derived using data sets inferred or directly measured from past exploration missions to Venus: the real part is obtained by calculating the total polarization of the ...
We observed superluminal light in aqueous solution of the protein complex bacteriorhodopsin (bR) at 647.1 nm wavelength where it exhibits reverse saturable behavior, exploiting the technique of coherent population oscillations (CPO). With a modulation frequency of 10 Hz, the signal pulse through a 1 cm path cell is ahead by 3 msec relative to the reference pulse, corresponding to a group velocity ...
A model is derived for the resonance absorption of molecular bands composed of Lorentzian lines is suitable for calculating fluorescence from irradiated air. The model is based on an explicit functional form derived for the resonance absorption of a single Lorentzian line which properly accounts for the possibility of unequal emission ...
Resonance Raman spectra and excitation profiles have been obtained within the 5700-6300-A absorption band of purified sperm whale metmyoglobin hydroxide (MbIIIOH) solutions. A large enhancement occurs for a Raman peak at 490 cm-1 which is shown by isotopic substitution of 18O for 16O to be almost purely an Fe-O stretch. The Fe-O ...
The 3250/cm 'ice' band observed in absorption and polarization in interstellar spectra is studied in
... (Author). Descriptors : (*AROMATIC COMPOUNDS, BAND SPECTRA), (*NITROGEN HETEROCYCLIC COMPOUNDS, ABSORPTION SPECTRA ...
