High-resolution Fourier transform absorption spectra of ozone broadened by N2 and O2 have been recorded at room temperature and at 225 K. Nitrogen- and oxygen-broadened half-widths and their temperature dependence for respectively 160 ro-vibrational transitions on the 16O3 ν 3 band with a wide range of rotational quantum numbers J (2–48) and Ka (0–8) have been determined.

Collision effects on water vapor at low concentration in a mixture with noble gases (helium, argon and xenon) have been studied by Fourier transform spectroscopy in the pressure range where line narrowing by dynamic confinement (Dicke effect) and collision broadening are observable, i.e. when the Voigt function cannot reproduce the observed profiles. Precise values of the broadening parameter have been obtained for the P and Q branches of the H2O ν 2 band taking into account molecular confinement (hard or soft collisions). The broadening parameter value derived from a Voigt profile for H2O lines perturbed by helium is smaller by about 10% than values determined using the soft or hard collision model. For H2O lines perturbed by argon or xenon this difference can reach more than 50% for the narrowest lines.

We report the nitrogen-induced shifting coefficients of 37 water vapour rovibrational transitions in the 1845-2140 cm(-1) spectral region. The measurements were made with a Fourier transform spectrometer at Paris University in the 258-330 K temperature range at a spectral resolution of 0.005 cm(-1) for lines with low state rotational quantum number up to 14. The measured exponents of the temperature dependence of the width exhibit a large range of values from 0 to 2.5. Theoretical calculations are based on impact theory modified by introducing additional parameters to extend the use of empirical data. The model parameters are determined by fitting the broadening and shifting coefficients to experimental data. The calculated line shift coefficients as well as the temperature exponents for the line shift agree satisfactorily with measured values.

The development of Gestion et Etude des Informations Spectroscopiques Atmospheriques (GEISA: Management and Study of Spectroscopic Information) was started over three decades at Laboratoire de Meteorologie Dynamique (LMD) in France. GEISA is a computer accessible spectroscopic database, designed to facilitate accurate forward radiative transfer calculations using a line-by-line and layer-by-layer approach. More than 350 users have been registered for on-line use of the GEISA facilities. The current 2003 edition of GEISA (GEISA-03) is a system comprising three independent sub-databases devoted respectively to: line transition parameters, infrared and ultraviolet/visible absorption cross-sections, microphysical and optical properties of atmospheric aerosols.Currently., GEISA is involved in activities related to the assessment of the capabilities of IASI (Infrared Atmospheric Sounding Interferometer on board of the METOP European satellite) through the GEISA/IASI database derived from GEISA.The GEISA-03 content is presented, placing emphasis on molecular species of interest for Earth and planetary atmosphere studies, with details on the updated 2008 archive underway. A critical assessment on the needs, in terms of molecular parameters archive, related with recent satellite astrophysical missions is made. Detailed information on free online GEISA and GEISA/IASI access is given at http://ara.lmd.polytechnique.fr and http://ether.ipsl.jussieu.fr. (C) 2008 Elsevier Ltd. All rights reserved.

We present measurements of He-broadening parameters for the R(0) and P(2) lines in the fundamental band of 13CO at different temperatures between 12K and room temperature. The broadening parameters are determined, taking into account confinement narrowing, by simultaneous least-squares fitting of spectra recorded using a frequency stabilized diode laser spectrometer. The pressure broadening cross sections are deduced and compared to close-coupling calculations and earlier results obtained for rotational transitions of 12CO.

Absolute line intensities of (CO2)-C-13-O-16 were retrieved from high-resolution Fourier transform spectra recorded in the region 30903920 cm(-1). The uncertainty of the line intensity determination is estimated to be between 3 and 5% for the strong lines. The global fittings of the observed line intensities within the framework of the effective operators approach have been performed, reaching the experimental accuracy. A comparison of newly measured line intensities with those found in the HITRAN database is presented. (c) 2005 Elsevier Inc. All rights reserved.

Absolute line intensities of 13C16O2 were retrieved from high-resolution Fourier transform spectra recorded in the region 3090–3920cm−1. The uncertainty of the line intensity determination is estimated to be between 3 and 5% for the strong lines. The global fittings of the observed line intensities within the framework of the effective operators approach have been performed, reaching the experimental accuracy. A comparison of newly measured line intensities with those found in the HITRAN database is presented.

The content of the current (2003) version, GEISA/IASI-03, of the computer-accessible spectroscopic database, GEISA/IASI, is described. This "system" or database is comprised of three independent spectroscopic archives, which are (a) a database of individual spectral line parameters on 14 molecules, H2O, CO2, O-3, N2O, CO, CH4, O-2, NO, SO2, NO2, HNO3, OCS, C2H2, N-2, and the related 51 isotopomers and isotopologues, representing 702,550 entries, in the spectral range 599-3001 cm(-1), (b) a database of spectral absorption cross-sections (6,572,329 entries related to six molecules, CFC-11 CFC-12, CFC-14, HCFC-22, N2O5, CCl4), and a catalogue of microphysical and optical properties (mainly, the refractive indices) of atmospheric aerosols. The modifications and improvements, which have been implemented since the earlier editions of this database, in terms of content and management, have been explained in detail. GEISA/IASI has been created with the specific purpose of assessing the capability of measurement by the IASI instrument within the designated goals of ISSWG in the frame of the CNES/EUMETSAT European Polar System preparation.All the archived data can be handled through a user-friendly associated management software, which is posted on the ARA/LMD group web site at http://ara.lmd.polytechnique.fr. (c) 2005 Elsevier Ltd. All rights reserved.

{S.A. Tashkun, V.I. Perevalov, J.-L. Teffo, L.S. Rothman, and Vl.G. Tyuterev, J. Quant. Spectrosc. Radiat. Transfer \underline{60{Y. Ding, P. Macko, D. Romanini, V.I. Perevalov, S.A. Tashkun, J.-L. Teffo, S. Hu, and A. Campargue, J. Mol. Spectrosc. \underline{226{S.A. Tashkun, V.I. Perevalov, J-L. Teffo, A.D. Bykov, and N.N. Lavrentieva, J. Quant. Spectrosc. Radiat. Transfer \underline{82

We have constructed a stabilized low temperature infrared absorption cell cooled by an open cycle refrigerator, which can run with liquid nitrogen from 250 to 80K or with liquid helium from 80K to a few kelvin. Several CO infrared spectra were recorded at low temperature using a tunable diode laser spectrometer. These spectra were analyzed taking into account the detailed effects of collisions on the line profile when the pressure increases. We also recorded spectra at very low pressure to accurately model the diode laser emission. Spectra of the R(2) line in the fundamental band of 13CO cooled by collisions with helium buffer gas at 10.5K and at pressures near 1Torr have been recorded. The He-pressure broadening parameter (γ0=0.3cm−1atm−1) has been derived from the simultaneous analysis of four spectra at different pressures.

We resent a line profile study at 150, 110 and 80 K for the R(7) line in the fundamental band of (CO)-C-13 perturbed by Ar in a new stabilized low-temperature cell cooled by liquid nitrogen. The broadening, shifting and narrowing parameters are determined taking into account the absorber speed dependence by simultaneous least-squares fitting of spectra over a 4-300 Torr pressure range recorded using a frequency-stabilized diode laser spectrometer. When the cell is cooled by liquid helium the (1-0) R(2) line of (CO)-C-13 in collision with helium is observed at a temperature of 6.9 K.

Forty-seven N2 broadened water vapor line-widths have been measured in the 1845–2140cm−1 spectral range with a Fourier Transform spectrometer in the 258–330K temperature range at a spectral resolution of 0.005cm−1 for the lines with upper state rotational quantum number up to 16. The measured exponents of the temperature dependence of the width exhibit a large range of values from 1.60 to −0.86. Theoretical calculations were made using a semi-empirical technique based on the Anderson theory. The calculated broadening coefficients as well as the temperature exponents for the half-width agree satisfactory with measured values.

The method of effective operators has been applied to the global fitting of line intensities of the acetylene molecule in the middle infrared. Simultaneous fittings of recently observed line intensities in the cold and hot bands lying in the 13.6, 7.8, and 5 μm regions have been performed. The eigenfunctions of the effective Hamiltonian developed for the global treatment of the vibration–rotation line positions of acetylene [O.M. Lyulin, V.I. Perevalov, S.A. Tashkun, J.-L. Teffo, in: Leonid N. Sinitsa (Ed.), 13th Symposium and School on High Resolution Molecular Spectroscopy, Proceedings of SPIE, vol. 4063, 2000, pp. 126–133] have been used in the calculations. The sets of effective dipole moment parameters obtained reproduce the observed line intensities within the experimental accuracy. The importance of l-type resonance, responsible for some large differences between intensities of the same lines in subbands having opposite parities, is exhibited and discussed.

The 2000 HITRAN edition, with the updates of 2001, contains improved and new data on the acetylene molecule. The main changes concern the 13.6- and 7.5-μm spectral regions (improved line intensities), and the 5-μm region (previously absent from the database). These changes are reviewed, and the key problem of the validation of line intensities is dealt with. The status of the currently available line parameters is critically examined, and recommendations for future improvements are given.

A careful comparison of four sets of ozone line intensities measured independently in the 10 μm region has been achieved. It is demonstrated that three of the experimental sets agree to better than 2% whereas the last one is consistently 4.4% higher. This is also the case for the ozone line intensities given in the HITRAN database, which are about 4% higher than the values given in the three experimental sets in agreement. New and more accurate transition moment constants for the ν1 and ν3 bands of 16O3 were derived and used to generate new line positions and intensities. These new spectroscopic parameters allow one to simulate atmospheric spectra recorded by the Atmospheric Trace Molecule Spectroscopy Experiment better than the existing HITRAN spectroscopic parameters, showing that on a relative basis the new spectral parameters are of better quality.

Author Institution: Harvard-Smithsonian Center for Astrophysics, Atomic and Molecular Physics Division; Laboratoire de Physique Mol\'eculaire et Applications, CNRS, case courrier 76, Universit\'e Pierre-et-Marie-Curie; Groupe de Spectrom\'etrie Mol\'eculaire et Atmosph\'erique, Universit\'e de Reims-Champagne-Ardenne, CNRS