High Resolution Overtone Spectroscopy of Acetylene Van Der Waals Complexes

Physics

Scientific paper

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Infrared/Raman

Scientific paper

The latest upgrades and results from the FANTASIO+ set-up (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 ±1× 10-3 Cm-1 accuracy) and the ring-down time (130 μs), the spectrum of C_2H_2-N_2 around 6500 Cm-1 was recorded as well as absorption bands due to combined excitations of intra and intermolecular modes of C_2H_2-Ar, C_2H_2-CO_2 and C_2H_2-N_2O. A hot absorption band of the van der Waals complex C_2H_2-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.
Didriche et al., Mol. Phys. 2010, 108, 2158-2164

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