Rotational state dependence of decay dynamics in the superexcited 7fRydberg state (ugr;=1) of NO

摘要

The decay dynamics of the 7fRydberg state (ugr;=1) of NO has been investigated with laser multiphoton excitation methods; not only NO+ions generated by autoionization, but also fragment nitrogen atoms produced by predissociation have been directly probed. The fragment atoms have been found to populate both the 2p32DJand 2p34S3/2states. Population yield in the4Sstate shows strong dependence on each 7frotational level of NO, and this dependence is remarkably correlated with autoionization yield, while no such significant dependence exists for the2Dstate. From the fact that only oddLlevels generate the4Sstate, dissociative states causing this predissociation process have been identified as Sgr;+states. Through detailed analysis, it has been shown that the predissociation rate of this channel is much larger than the autoionization rate, and that the N(2D)hyphen;generating predissociation is also mainly caused by dissociative Sgr;+states. Moreover, it has been found that a major part of the total decay rate of each rotational level is strongly correlated with magnitude of itsfsgr; character. From these facts, it has been concluded that the decay process in the 7fstate is mainly governed by predissociation due todirectcoupling with dissociative Sgr;+valence states, which have been identified asArsquo;thinsp;2Sgr;+andIthinsp;2Sgr;+for the N(4S)hyphen; and N(2D)hyphen;generating predissociation channels, respectively.