HIGH-RESOLUTION INFRARED AND RAMAN SPECTROSCOPY OF SF6_6: THE STATE-OF-THE-ART IN JUNE 2006

Author Institution: LPUB -- CNRS UMR 5027, 9 Av. A. Savary, BP 47870, F-21078 Dijon Cedex, France; Instituto de Estructura de la Materia, CSIC Serrano 123, E-28006 Madrid, Spain; Fachbereich C -- Anorganische Chemie, Bergische Universitat Wuppertal, D-42097 Wuppertal, Germany; LADIR -- CNRS UMR 7075, Case Courrier 49, 4 Place Jussieu, F-75252 Paris Cedex 05, FranceSulfur hexafluoride is recognized by the Kyoto Protocol as a powerful greenhouse gas whose emissions should be monitored and reduced. Although its abundance is still relatively small ($3.8\times 10^{-6}$ ppmv), it is increasing rapidly ($8$ \%$/$year) while the lifetime of SF$_6$ in the atmosphere is extremely long ($3200$ years) with a Global Warming Potential equal to 23900 compared to CO$_2$} {\bf 24}, 675--678 (1997).}$^,$}. It is thus necessary to correctly model the atmospheric absorption of SF$_6$} (2006).}, especially in the strongly absorbing $\nu_3$ region (near $939$ cm$^{-1}$). Until recently, however, respective spectra were not very well known. In particular, the knowledge of hot bands is very important for atmospheric applications, but this implies to study various vibrational levels, some being only accessible through Raman scattering. During the past decade, we have analyzed different fundamental, harmonic and combination bands for both ${}^{32}$SF$_6$ and ${}^{34}$SF$_6$ using high-resolution infrared and Raman spectra} {\bf 222}, 291--295 (2003), V. Boudon, J. L. Domenech, D. Bermejo and H. Willner, {\em J. Mol. Spectrosc.\/} {\bf 228}, 392--400 (2004) and references therein.}. In this talk, we will discuss the present status and prospects of SF$_6$ spectroscopy. In particular, new spectra and analyses of ${}^{34}$SF$_6$ will be reported and discussed. We will also show that a correct modelling of absorption intensities is still a pending question

Fourier transform microwave spectrum of (HCCCN)-N-15 and global analysis of the high resolution infrared and rotational spectra up to 1700 cm(-1)

The rotational spectrum of an enriched sample of HC C-C N-15 was measured in the range 8-27 GHz by means of a waveguide Fourier transform microwave spectrometer. New transitions were also measured in the millimetre- and submillimetre ranges. These measurements combined with the available rovibrational and rotational data [Fayt et al., J. Mol. Struct. 695-696 (2004) 295], with many newly assigned infrared bands, were used for a global rovibrational analysis of all vibrational states up to 1700 cm(-1). A full set of 243 molecular parameters for the modes upsilon(4)-upsilon(7) has been deduced. (C) 2008 Elsevier B.V. All rights reserved