Direct study of energy transfer of vibrationally highly excited CS2 molecules

Collisional energy transfer at 300 K of vibrationally highly excited CS2 molecules (excitation energies 28 660 and 32 640 cm−1) is studied directly by time resolved UV absorption spectroscopy after laser excitation at 351 and 308 nm. Average energies 〈ΔE〉 transferred per collision for 27 bath gases are derived. A marked dependence of 〈ΔE〉 on the excitation energy is noted; the steepness of this dependence is not the same for all bath gases. The results are compared with energy transfer data for vibrationally highly excited large molecules.