State-selected photodissociation dynamics of CS2+ in the (C)over-tilde 2Σg+ state

State-selected photodissociation dynamics of CS2+ molecular ion has been investigated by an optical-optical double resonance technique. The CS2+ molecular ions were prepared by [2+1] REMPI and the predissociative (C) over tilde (2)Sigma(g)(+) state was populated by the (B) over tilde (2)Sigma(u)(+)<--(X) over tilde (2)Pi(g,3/2) followed by (C) over tilde (2)Sigma(g)(+)<--(B) over tilde (2)Sigma(u)(+) transition. The product branching ratios, CS+/S+, for selected vibrational levels in the C state and average kinetic energy releases in the CS+ and S+ production channels were measured from the time-of-flight mass spectra. It has been found that excitation of the bending vibration enhances the CS+ production channel more than the S+ channel. In addition, an isotropic fragment distribution for different polarizations of the dissociating laser light has been observed, from which the dissociation time was estimated to be longer than 20 ps. Dynamical aspect of the reaction revealed by the present investigation is discussed together with the previous spectroscopic results. (C) 2000 American Institute of Physics. [S0021-9606(00)00734-0].