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K. DIDRICHE, C. LAUZIN, X. DE GHELLINCK, T. FOLDES AND 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.
Several improvements have been made on the apparatus developed in Brussels for the study of jet-cooled molecules, named \hboxFANTASIO \footnoteC. Lauzin, K. Didriche, P. Macko, J. Demaison, J. Liévin and M. Herman J. Phys. Chem. A \underline\textbf113, 2359 (2009)., for "Fourier trANsform, Tunable, diode and quadrupole mAss spectrometers interfaced to a Supersonic expansIOn". The upgraded setup, called Femto-FANTASIO, is presented.
These improvements include: a doubling of the pumping efficiency, by adding another turbomolecular pump Leybold MAG-W3200 CT; an increase in sensitivity in the 1.5 µm range thanks to a new CRDS system, consisting in new cavity mirrors, leading to a ring down time of 125 µs and a new detector, decreasing the noise level; a new injection system to probe samples liquid at STP conditions; a temperature controlled nozzle/slit; and as an alternative probe technique, an absorption source, tunable from 3000 to 9000 cm-1, coupling an optical parametric oscillator (OPO), pumped by a Ti:Sa femtosecond laser, to a high resolution continuous scan Fourier transform interferometer.
Femto FANTASIO will be used to investigate molecular complexes. First results and achievements of this new setup are presented.