			15min:

HIGH RESOLUTION OVERTONE SPECTROSCOPY OF ACETYLENE VAN DER WAALS COMPLEXES.

K. DIDRICHE, C. LAUZIN, T. FOLDES, X. DE GHELLINCK, M. HERMAN, Service de Chimie quantique et Photophysique CP160/09, Faculté des Sciences, Université Libre de Bruxelles (U.L.B.), Av. Roosevelt, 50, B-1050, Bruxelles, Belgium.

The latest upgrades and results from the FANTASIO+ set-up\footnoteDidriche et al. , Mol. Phys. 2010, \textbf108, 2158-2164 (for 'Fourier trANsform, Tunable, diode and quadrupole mAss spectrometers interfaced to a Supersonic expansIOn') are presented. Thanks to the improvements of the calibration (better than \pm1× 10^-3 cm^-1 accuracy) and the ring-down time (130 µs), the spectrum of C₂H₂-N₂ around 6500 cm^-1 was recorded as well as absorption bands due to combined excitations of intra and intermolecular modes of C₂H₂-Ar, C₂H₂-CO₂ and C₂H₂-N₂O. A hot absorption band of the van der Waals complex C₂H₂-Ar was also observed. The first analyses of these spectra will be presented.

Along the development of the FANTASIO+ set-up, a new injection system to probe samples liquid at STP conditions, and a pulse injector are currently under implementation. Those upgrades will allow the study of organic and prebiotic molecules and a better cooling of the gas in the expansion, respectively. The first results will also be presented.