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Abstract
We have used subpicosecond deep UV laser pulses (near 205 nm) 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 2Σ+(3sσ) (ν=2) state. The two-photon excited state lifetime exhibits a strong pressure dependence from which the collisionless lifetime and the bimolecular depopulation or quenching rate constant were obtained. The large quenching rate constant strongly suggests that the state is a medium (10–12) n Rydberg level in the series converging to the ground electronic state of NO+. The subnanosecond collisionless lifetime implies that this state is subject to predissociation and/or autoionization.
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