Nov 1, 1977 ... This atlas of infrared absorption line contains absorption line parameters (line strength vs.

... 'THE STRENGTHS. OF ABSORPTION LINES IN THE 2-0 BAND, OF CARBON MONOXIDE Tc ,sa UP Oppenheim S(Technion, ...

... Title : MEASUREMENT OF WEAK IR ABSORPTION WITH A TUNABLE LASER: THE HYDROGEN S SUB 2(1) LINE STRENGTH, IN: APPLIED ...

Plots of logarithm (base 10) of absorption line strength versus wavenumber from 0 to 17900/cm(sup)-1

Absorption line strengths have been measured at 295 K for the first time for four vibration-rotation

to the development of a quite accurate model of dispersion theory with distinct oscillator strengths for the different absorption lines, which was ...

... ATOMIC SPECTROSCOPY, COPPER, INTENSITY, ABSORPTION SPECTRA, HARTREE FOCK APPROXIMATION, VISIBLE SPECTRA ...

HD spectra was studied in the UV about as thoroughly as those of H/sub 2/. The vibration-rotation line positions are known. However, the theory does not do well in calculating the absorption strengths. These tend to be stronger than the quadrupole strengths for H/sub 2/ and so more lines were ...

Zone (Slab). Density ... Modeling of Absorption Spectra. Column (LoS) velocity cross-section. modeling progressive absorption lines. Wind optical depth. Line photoabsorption cross-section fij = oscillator strength ...

An algorithm has been developed to calculate rapidly and accurately the rate at which the ozone nu3 fundamental band absorbs IR radiation in the terrestrial upper mesosphere and lower thermosphere. Accurate knowledge of this rate is essential for studies of non-LTE processes in ozone and for estimating ozone concentrations from measurements of non-LTE IR emission from the middle atmosphere. In the ...

Mar 1, 2011 ... Quantities like dipole moments, transition probabilities, Einstein coefficients and line strengths, radiative life times, absorption cross ...

of this non-detection for the standard estimates of the strength of this line. I . INTRODUCTION. Atmospheric absorption prevents astronomical observations ...

... Abstract : The atomic absorption cross section of neutral argon between the (2 ... presented are oscillator strengths and line positions for n = 9 to 30. ...

Mar 1, 2011 ... Quantities like dipole moments, transition probabilities, Einstein coefficients and line strengths, radiative life times, absorption cross ...

We present initial results of an investigation of the near infrared absorption spectrum of 15NH3 between 6468 and 6692 cm-1. A widely tunable external cavity diode laser is used in a direct absorption setup to determine the line positions and line strengths of several lines ...

This paper lists the strongest atomic resonance lines longward of 912 A that are suitable for use in search lists for QSO absorption systems. The 179 lines have been selected according to the cosmic abundance of the element, the ionization potential of the atom, and the expected unsaturated equivalent width of the transition. ...

We have established a new database of absorption and emission line measurements from the Sloan Digital Sky Survey 7th data release for the galaxies within a redshift of 0.2. This work used publicly available codes, pPXF(penalized pixel-fitting) and GANDALF(gas and absorption line fitting), to achieve robust ...

Analysis of high-resolution spectra of classical barium giants reveals that an unidentified line is a major contributor to the stellar-absorption feature at 6707.8 A attributed previously to a blend of CN lines and the Li I resonance doublet. The strength of the unidentified line is well ...

Growth curves are constructed for solar Ti I and Ti II absorption lines using seven different sets of oscillator strengths. It is assumed that all the lines originate in the same layers of the solar atmosphere. The number of lines calculated for Ti I was four, and three ...

A recent experimental K? transmission spectrum of an aluminum plasma is theoretically studied by a detailed level accounting model. It is found that the orbital relaxation effects of the K- and L-shell orbitals should be considered to calculate accurate line positions and strengths. To do this the initial and the final radial wave functions of K? ...

Fourier transform infrared absorption spectroscopy has been used for the determination of the line strengths of 41 CO and CO[sub 2] absorption lines at temperatures between 295 and 1250 K. The CO vibrational-rotational lines were from the [ital P] branch of the fundamental ...

The strong absorption lines in the spectrum of the quasar Q0248 + 4302 are discussed. The absorption has been shown to be produced in a sinuous tidal tail which emanates from the nearby galaxy pair G0248 + 4302A,B. There is a velocity difference of about 260 km/s between the systemic redshift of the interacting galaxies and the ...

Absorption spectra of ten self-broadened lines in the 6.3 micron band of water vapor were obtained using a 100 foot long absorption cell with water vapor concentrations between 0.0092 pr. cm and 0.042 pr. cm. With an optical path of 19800 cm, all of the l...

... Behar E., Kahn S.M. Table: Wavelengths, oscillator strengths, radiatvie decay rates, and autoionization rates of 2-3 transitions from the ground states ...

IUE absorption-line data obtained at 110-320 nm with resolution 10-30 pm toward the B-star component

Forbidden absorption lines of neutral oxygen, originating in the ground state, have been observed in 70 G and K stars. Since oxygen is neutral there is little uncertainty in the interpretation of strength in terms of atomic oxygen abundance. The associati...

The spectra were collected with the LRIS on the Keck II Telescope, which has a 7.7arcmin long slit. We selected galaxies from Palomar Observatory Sky Survey prints of the centre of the Coma cluster. (2 data files).

Magnetic field intensities H in sunspot umbrae were measured using 158 polarized spectrograms obtained during 26.06 - 2.08 1957 at the Solar Tower Telescope of the Crimean Astrophysical Observatory. The distribution H in the spot umbra are compared, being determined by the absorption lines Fe I ?6302.5 �, V I ?6285.2 � and ? 6296.5 �. It is supposed ...

We present ultraviolet spectra of the Mira AB binary system taken by the International Ultraviolet Explorer during the period from 1979 to 1995. In this study, we concentrated on the Mg II k and h emission lines arising primarily from Mira B. The broad Mg II profiles from Mira B are enhanced on the red side of the profile and obscured on the blue side due to obscuration by the ...

A new method is described for obtaining the temperature profile in the stratosphere and lower mesosphere from observations of the absorption spectrum of the high J lines of carbon dioxide at 4.3 microm. This concept is based upon the measurement of the integrated absorption of individual CO(2) lines whose ...

The Quasar Absorption Line Survey of bright sources is an efficient observing program designed to provide a homogeneous data base of absorption features. The data will reveal absorption regions in galaxies, in clusters of galaxies, in voids, in large-scale structures, in Lyman ALPHA clouds, and wi provide ...

The Quasar Absorption Line Survey of bright sources is an efficient observing program designed to provide a homogeneous data base of absorption features. The data will reveal absorption regions in galaxies, in clusters of galaxies, in voids, in large-scale structures, in Lyman ALPHA clouds, and wi provide ...

Quasar absorption lines in flat universes with nonzero cosmological constant Lambda are examined and

... Accession Number : AD0619963. Title : INVESTIGATION OF NARROW LINE ABSORPTIONS IN SINGLE CRYSTAL CALCITE. ...

... Title : ABSORPTION LINE SERIES AND AUTOIONIZATION RESONANCE STRUCTURE ANALYSIS IN THE ULTRAVIOLET SPECTRUM OF SR I,. ...

The authors report the first results of an extended program to measure magnetic field strengths in interstellar molecular clouds. The very large radio telescope located near Nan�ay, France, has been used to measure the Stokes-parameter I and V spectra of the 1665 and 1667 MHz lines of OH in emission and in absorption from extended ...

Interstellar molecular oxygen should be detectable in interstellar clouds through observations of its absorption lines in the spectra of background stars. This paper describes and presents the results of measurements of oscillator strengths for some lines in the vacuum ultraviolet (VUV) spectrum of O/sub 2/. ...

The radiant emission of a mercury-argon discharge in a fluorescent lamp assembly (10) is enhanced by providing means (30) for establishing a magnetic field with lines of force along the path of electron flow through the bulb (12) of the lamp assembly, to provide Zeeman splitting of the ultraviolet spectral line. Optimum results are obtained when the ...

The radiant emission of a mercury-argon discharge in a fluorescent lamp assembly is enhanced by providing means for establishing a magnetic field with lines of force along the path of electron flow through the bulb of the lamp assembly, to provide Zeeman splitting of the ultraviolet spectral line. Optimum results are obtained when the magnetic field ...

The spectrum of the peculiar emission-line star XX Oph in the spectral interval 6200 A to 9000 A is described. Strengths of two TiO bandheads at 8859 A and 8937 A indicate the spectral type of the cool companion is M5 or M6. A list of all the emission lines and absorption lines in the spectrum ...

A Beer's Law experiment was performed with a tunable diode laser to find the N2 pressure broadening characteristics of a single 03 absorption line at 1129.426 cm for N2 pressures from 10 to 100 torr (O3 pressure = 3.16 torr). SO2 line positions were used ...

... Accession Number : AD0600888. Title : DETERMINATION OF SPECTRAL LINE STRENGTH BY THE EXPANSION CALCULATION METHOD. ...

Two different interpretations of the phenomenon of broad absorption line (BAL) QSOs are presented and a resolution is suggested. One interpretation is that the BAL clouds cover most of the sky as viewed from the quasar; this implies that BALQSOs are an usual subset of the general class of QSOs. The other interpretation suggests that the BAL clouds cover ...

Literature values for the equivalent width of the interstellar absorption line of Ca II K (3933 A) are used to constrain a simple empirical model for the strength of this line as a function of distance from the galactic plane. The best-fit model has an integrated Ca II K equivalent width in the direction ...

... THE ABSORPTION AND FIELD STRENGTH OF RADIO WAVES FOR OBLIQUE INCIDENCE UPON THE IONOSPHERE-GEOMAGNETISM AND ...

... Title : THE EFFECTS OF WIDTH AND THICKNESS ON STRENGTH, ENERGY ABSORPTION AND TRANSITION TEMPERATURE FOR ...

The optical absorption lines of quasars are examined, and implications of the lines for the physical

An improved model for the absorption of the atmosphere near the 22-GHz water vapor line is presented. The Van Vleck-Weisskopf line shape is used with a simple parameterized version of the model from Liebe et al. [1993] for the water vapor absorption spectra and a scaling of the model from Rosenkranz [1993] for the ...

Space-based active sensing of CO(2) concentration is a very promising technique for the derivation of CO(2) surface fluxes. There is a need for accurate spectroscopic parameters to enable accurate space-based measurements to address global climatic issues. New spectroscopic measurements using laser diode absorption spectroscopy are presented for the preselected R30 CO(2) ...

In situ combustion measurements of water vapor concentration and gas temperature were carried out with a new tunable diode laser sensor near 2.5 �m. Recent availability of room-temperature semiconductor diode lasers operating at longer wavelengths provides access to fundamental vibrational bands (?1 and ?3) of H2O. These bands have stronger absorption ...

The authors analyze the electronic absorption and photoelectron spectra of the alkylated chromium complexes of bis-benzene and bis-toluene construct a quantum-chemical atomic model to determine ionization potentials, oscillator strengths, Rydberg constants and corrections, and various spin, dipole, and forbidden transitions allowed by the symmetry groups ...

We show that in a magnetic field B the otherwise forbidden lowest exciton in Cu2O (paraexciton of Gamma(2)(+) symmetry) gives rise to a narrow absorption line of 80 neV at a temperature of 1.2 K. The B2 dependence of the field-induced oscillator strength and the low energy shift DeltaE with increasing field ...

This report describes a study of several models for computer prediction of the levels of high-frequency radio-wave absorption in auroral regions. These predictive schemes are required in advanced versions of the PROPHET and related software, which is used for field strength predictions and for estimating the probability of communication between two points ...

The spectrophotometric technique is currently the only technique used to characterize the gas complexation reactions between lanthanide and actinide halides and group III halides. In several cases a temperature-dependent molar absorptivity has been observed. To explain this observation, a temperature-dependent line width and ground state population ...

High-redshift QSOs often have rich absorption spectra, which may be formed in clouds or filaments either associated with the QSO or at cosmological distances from the continuum source. The strongest lines in these spectra often are split into two or more components separated by about one line width. It has usually been assumed that the ...

We examine variability of absorption line strength of intervening systems along the line of sight to GRB 060206 at z = 4.05, by the low-resolution optical spectra obtained by the Subaru telescope from six to ten hours after the burst. Strong variabilities of Fe II and Mg II lines at z = 1.48 ...

A new computer program, LINES, has been developed for simulating atomic line emission and absorption spectra using the accurate fine structure energy levels and transition strengths calculated by the (CATS) Cowan Atomic Structure code. Population distributions for the ion stages are obtained in ...

We present a composite spectrum of 60 long duration gamma-ray burst (GRB) afterglows with redshifts in the range 0.35 < z < 6.7 observed with low-resolution optical spectra. The composite spectrum covers the wavelength range 700-6600 � in the rest frame and has a mean signal-to-noise ratio of 150 per 1 � pixel and reaches a maximum of ~300 in the range 2500-3500 �. Equivalent widths ...

Based on the {C iv} UV resonance line profile of {HD93521} ({O9.5V}), Massa (1992) and Howarth & Reid (1993) have suggested that there is a high speed component in the polar outflow from the star as well as a low speed component in the equatorial regions. We present theoretical calculations of the line profiles that would be produced by such a model. ...

The HULLAC atomic code is used to compute wavelengths and oscillator strengths for the 1s-np inner-shell absorption lines in Li-like to F-like ions of neon, magnesium, aluminum, silicon, sulfur, argon, calcium, and iron. Many of these lines are expected to be observed in Chandra and XMM-Newton high-resolution X-ray ...

The visible spectra of the rare-earth metals Pr, Nd, Sm, and Er were examined to determine whether they contain absorption lines due to transitions within the 4f-shell. Optical measurements were made on vacuum evaporated transparent films at 90 deg K. No spectral lines were round. It was shown by complete oxidation of the ...

The equivalent widths of the Mg II resonance doublet and their subordinate lines near 2800 A were determined in ten stars of spectral types A through O. Combining the current results with previously published results for four F stars, it is found that the total equivalent widths of the Mg II lines follow a pattern and that the maximum in ...

This paper explores a modified form of Gray's technique of determining classical microturbulence (T) by Fourier analysis of line profiles. The technique entails the transformation of the functions defined by absorption-line scans to Fourier power spectra. Our instrumental resolution of 0.05 A does not reduce the ...

The line strengths of nine Q-branch lines in the nu(2) fundamental band of the methyl radical in its ground electronic state have been measured by diode laser absorption spectroscopy. The vibration-rotation spectrum of methyl was recorded in a microwave discharge in ditertiary butyl peroxide heavily diluted in ...

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 ...

High-resolution IUE spectra of V471 Tauri reveal the presence of a very-high-velocity cool expanding gas in the line of sight to the binary system with an expansion velocity of -1200 km/s. The summed strength of the coadded absorption is 125 mA + or - 25 mA, with FWHM = 30 km/s. It is suggested that the observed ...

We explore a new geometry allowing effective excitation of the lowest antisymmetric standing spin wave mode in ferromagnetic metallic films with symmetrical boundary conditions. The approach is based on the use of a coplanar waveguide with the ferromagnetic film, Permalloy (Py), playing the role of the signal line. In addition, we study a signal line which ...

Abstracts of one hundred papers given at the conference are presented along with the conference program and an author index. Session topics include: highly ionized atoms; laser spectroscopy and hyperfine structure; complex spectra; laser spectroscopy, radiation theory; theory of highly ionized atoms and analysis of plasmas; plasma spectroscopy, line ...

The absorption line strengths of electric-dipole-forbidden (magnetic dipole and electric quadrupole) transitions have been calculated in the evanescent light field that accompanies the total reflection of light. Owing to the complex wave and polarization vectors of the evanescent light, the apparent oscillator ...

We carry out cosmological chemodynamical simulations with different strengths of supernova (SN) feedback and study how galactic winds from star-forming galaxies affect the features of hydrogen (H I) and metal (C IV and O VI) absorption systems in the intergalactic medium at high redshift. We find that the outflows tend to escape to low-density regions, and ...

Absorption cell, flat flame and shock tube experiments employing a tunable diode laser were used to measure the fundamental absorption band strength of NO at 5.3 microns, as well as the collision halfwidths of NO lines broadened by N2, Ar, and combustion gases. While room temperature absorption ...

We update the online SpectroWeb database of spectral standard reference stars with 1178 oscillator strength values of atomic absorption lines observed in the optical spectrum of the Sun and Procyon (? CMi A). The updated line oscillator strengths are measured with best fits to the ...

We collect information for 88 broad absorption line quasars (BALQSOs) from the literature and existing catalogues, creating the largest BALQSOs sample analyzed optically and X-ray to date. We performed a full X-ray spectral analysis with different models on the sample of 39 sources with higher number of counts, and an approximate hardness-ratio analysis on ...

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 fitting procedure, ...

How common are the building blocks of life in the Universe? We hope to further our knowledge in this field by searching QSO absorption line systems for organic molecules in extragalactic sources. Within the Milky Way, complex organic molecules are thought to be the cause of 300 absorption features known as the diffuse interstellar ...

Fourier transform infrared absorption spectroscopy has been used for the determination of CO and CO[sub 2] gas concentrations in a high-temperature cell. The gas mixtures analyzed consisted of CO, CO[sub 2], and nitrogen; among the samples, the concentration of CO was varied between 0.5 and 4.7% and the CO[sub 2] ranged between 0.7 and 4.9%. The temperature of the gas cell was ...

We employ detailed photoionization models to infer the physical conditions of intrinsic narrow absorption line systems found in high-resolution spectra of three quasars at z = 2.6-3.0. We focus on a family of intrinsic absorbers characterized by N V lines that are strong relative to the Ly? lines. The inferred ...

Tuneable infrared diode laser absorption spectroscopy at 16.5 �m and broadband ultraviolet absorption spectroscopy at 216 nm have both been used to measure the ground state concentrations of the methyl radical in two different types of non-equilibrium microwave plasmas (f = 2.45 GHz): (i) H2-Ar plasmas of a planar reactor with small admixtures of methane ...

We report the first ground-based IR observations of Io's atmosphere. We observed 15 lines of the ? 2 band of gaseous SO2 in the 18.9 ? m (529 cm-1) region, at a resolution of 50,000, with the TEXES mid-infrared spectrograph on the IRTF in November 2001. The lines appeared in absorption, probably due to non-LTE effects that produce ...

quasar's broad emission lines. The reddest extent of the broad-line absorption .... lines from the quasar and the low signal-to-noise ...

We propose a 100 ks observation of the high-luminosity, X-ray bright quasar E1821+643 (z=0.297). This source shows a significant redshifted Fe absorption line that can be interpreted either as pure gravitational redshift, or infall of matter onto the black hole. The absorption line is found superposed on the red ...

A star embedded in an optically thick dust shell may have a line spectrum that closely resembles the spectrum of some unobscured star--e.g., VY CMa (shrouded) and ..cap alpha.. Her (unshrouded). This implies that the surface temperatures of the two stars are nearly equal, but since one is subject to a back-warming effect, the distributions of temperature with depth in the ...

Molecular FeH provides a large number of sharp and isolated absorption lines that can be used to measure radial velocity, rotation, or magnetic field strength with high accuracy. Our aim is to provide an FeH atlas for M-type stars in the spectral region from 986 nm to 1077 nm (Wing-Ford band). To identify these ...