Molecular beams of CF3Br probed by spontaneous raman effect and excited with a CO2 laser

Molecular Beam Opto‐thermalStudy of the Multiple‐photonInfrared Excitation of CF3Br

“…On the other hand the position of this peak is near to the expected maximum of the P-branch of the single-photon absorption spectrum. This effect has been previously observed by Reuss and co-workers 35 who have recently reported the results of a free jet study aimed to study the collision-assisted excitation of CFaBr by means of a C.W. low power CO2 laser.…”

“…For this reason we expect that the differences between the different modes are less dramatic than in the results of Ref. 35. In any case our value of Tvib must be considered as an average over the normal vibrational modes of the molecule.…”

“…A much more drastic approximation is due to the assumption of a single vibrational temperature. Recent measurements carried out by Reuss and co-workers 35 have demonstrated the existence of strongly mode dependent vibrational temperatures in a molecular beam of CF3Br. Nevertheless in our experiment the vibrational relaxation in the beam expansion is quite small, because our beam source is operated at the low constant pressure of 350 mbar.…”