Effect of Vibrational Angular Momentum on the Lifetime of CS21B2(1Σ)State

Predissociation lifetimes of totally 13 vibrational levels in the 1B2 state of jet-cooled CS2 have been determined by simulating the rotational band contours of the PHOFEX spectrum in the range of 209. 5 ～ 216 nm， where the PHOFEX spectrum was obtained by monitoring the laser-induced fluorescence of CS fragment via the Q band head excitation of（A 1Π，v' = 0）&（X 1Σ + ，v" = 0）transition. In order to investigate the influence of vibrational angular momentum quantum number K of the excited 1B2 （ 1Σ + U ）state，the nozzle was heated to increase the hot-band transition intensities. The results indicate that，for levels with the same vibrational quantum number but different K numbers in the 1B2 （ 1Σ + u ）state of CS2 ，the lifetime decreases with the increasing of quantum number K， suggesting that the dissociation could be accelerated by K number.