Photoionization of single rotational levels in excitedBthinsp;2Pgr;,Cthinsp;2Pgr;, andDthinsp;2Sgr;+states of14N16O

摘要

Rotational state selective fluorescence excitation and twohyphen;color resonantly enhanced ionization of nitric oxide has been investigated under collision free conditions. Single photon absorption from a tunable VUV laser source prepared the molecules in the intermediateBthinsp;2Pgr;,Cthinsp;2Pgr;, andDthinsp;2Sgr;+states energetically close to the dissociation limit of NO. The dissociation ofCthinsp;2Pgr;(vrsquo;=0) atJrsquo;=2.5(2Pgr;3/2) andJrsquo;=3.5(2Pgr;1/2) as well asBthinsp;2Pgr;(vrsquo;=7) atJrsquo;=4.5(2Pgr;3/2) andJrsquo;=7.5 (2Pgr;1/2) was clearly established. Time delayed photoionization was used to measure the lifetimes of stable and weakly predissociative states. Photoionization cross sections of single rotational levels in the electronically excited states have been determined by saturating the ionization step.