DEEP ULTRAVIOLET FEMTOSECOND MPI STUDIES OF EXCITED STATE DYNAMICS OF NITRIC OXIDE AND CARBON DISULFIDE
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Date
1994
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Ohio State University
Abstract
Femtosecond deep uv (near 200 nm) pulses were used to directly measure excited slate lifetimes for $CS_{2}$ and NO in the gas phase. The lifetime of the $S_{3}$ state of $CS_{2}$ at 205 nm directly measured using femtosecond ultraviolet 1+1 multiphoton ionization spectroscopy is compared to previous indirect lifetime measurements for this state. The deep UV laser pulses have also been used in a time-resolved (2+1) multiphoton ionization study of the two-photon state of NO at 102 nm via a one-photon resonance with the $A^{2}\Sigma^{+}(3s \sigma) (\nu=2)$ state. The two-photon excited state lifetime exhibits a strong pressure dependence from which the collisionless lifetime and the bimolecular depopulation or quashing rate constant were obtained. The large quenching rate constant strongly suggests that the state is a medium {n} Rydberg level in the series converging to the ground slate of $NO^{+}$, The subnanosecond collisionless lifetime implies that this state is subject to predissociation and/or autoionization.
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Author Institution: Code 6111, Chemistry Division, Naval Research Laboratory