PROGRESS IN THE KNOWLEDGE OF C2H2C_{2}H_{2} SPECTROSCOPIC PARAMETERS IN THE IR

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, CNRSThe acetylene molecule is important for atmospheric, planetary, and astrophysics applications. In order to improve the knowledge of $C_{2}H_{2}$, systematic measurements of line parameters have been performed. Two main spectral regions have been studied in this work. First, in the $13.6-{\mu}m$ region, line intensities were revisited for the $\nu_{5}$ band and determined for some hot bands, allowing us to update the HITRAN database. Second, in the $5-{\mu}m$ region, numerous line parameters, including positions, intensities, self-broadening coefficients, and self-shifting coefficients of lines belonging to 18 bands were measured for the first time. Intensities were also measured for some new lines in the $4.5-{\mu}m$ region, and a good agreement was observed between previous measurements. Concerning the $3-{\mu}m$ region, where two cold bands were already analyzed for positions and intensities, but where the intensities of numerous hot lines are missing in HITRAN, a study is in progress, and preliminary results will be presented

12^{12}C16^{16}O2_2 LINE INTENSITIES AROUND 1.6 μ\mum WITH A PRECISION BETTER THAN 0.5 PERCENT

Author Institution: Laboratoire de Recherche sur la Physico-Chimie des Surfaces et Interfaces, Universite de Skikda,; BP 26, Skikda 21000, Algeria; Laboratoire de Physique Moleculaire et Applications, CNRS, case courrier 76,; Universite Pierre-et-Marie-Curie, 75252 Paris Cedex 05, France; Groupe de Spectrometrie Moleculaire et Atmospherique, CNRS, UMR 6089,; Universite de Reims-Champagne-Ardenne, Faculte des Sciences, BP 1039, 51687 Reims Cedex 2, France; Laboratoire de Photophysique Moleculaire, Unite Propre du C.N.R.S., Batiment 350,; Universite de Paris-Sud, 91405 Orsay, France, email: [email protected]\maketitle Using Fourier transform spectra (FTS) and a multispectrum fitting procedure, 395 absolute lineintensities of $^{12}$C$^{16}$O$_2$ have been measured}$C$^{16}$O$_2$line intensity measurements around 1.6$\mum, Journal of Molecular Spectroscopy, in press (2006).} between 6035 and 6950 cm^{-1}, for the 4 cold bands 30014-00001, 30013-00001, 30012-00001, and 30011-00001, and for the 3 hot bands 31113-01101, 31112-01101, and 01131-01101. Vibrational transition dipole moments and Herman-Wallis coefficients are reported for each band. Comparisons are made with previous experimental results and with data available in the HITRAN database and the Carbon Dioxide Spectroscopic Databank (CDSD).\\ Comparisons with experimental line intensities recently obtained} from FTS for the 2 bands 30013-00001 and 30012-00001 are also performed. They show a very good line by line agreement: (0.3 \pm$0.6)$\%$on the mean for a hundred of lines, with a maximum discrepancy 1.6$\%$. Thus, the accuracy of these sets of individual line intensities, which was originally estimated about 3$\%$on the average in both works, is likely better than 1$\%$. This is close to what is needed by some atmospheric experiments, as OCO

The GEISA spectroscopic database: Current and future archive for Earth and planetary atmosphere studies

The development of Gestion et Etude des Informations Spectroscopiques Atmosphériques (GEISA: Management and Study of Spectroscopic Information) was started over three decades at Laboratoire de Météorologie 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 on-line GEISA and GEISA/IASI access is given at http://ara.lmd.polytechnique.fr and http://ether.ipsl.jussieu.fr. © 2008 Elsevier Ltd. All rights reserved.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

The 2003 edition of GEISA

info:eu-repo/semantics/publishe