LASER-INDUCED FLUORESCENCE FROM SELECTED EXCITED-STATES OF THE CS2 MOLECULE

Gas-phase samples pf CS2 exhibit a richly structured absorption spectr um in the near-ultraviolet region extending from roughly 2900 to 3800 Angstrom. In this context, the fluorescence of the CS2 molecule was ex cited by a dye laser pumped by a Nd-YAG laser in the spectral interval 2800-3380 Angstrom. From the analysis of the fluorescence emission de cay of the CS2 molecule, two different processes were observed as the excitation wavelength was tuned from 2800 to 3380 Angstrom. Collision- free radiative lifetimes were determined and values for quenching rate constants in the range k(Q) approximate to (0.8 +/- 0.3) x 10(-10) -( 3.6 +/- 0.7) x 10(-10) cm(3) molecule(-1) s(-1) in the spectral region studied were obtained. (C) 1997 Elsevier Science B.V.