New electronic states of NH and ND observed from 258 to 288 nm by resonance enhanced multiphoton ionization spectroscopy

摘要

Three new electronic states of NH and ND (imidogen radical) have been observed by REMPI (resonance enhanced multiphoton ionization) spectroscopy in the region of 258 through 288 nm and assigned. The NH (ND) was produced by the photolysis of HN3(DN3) (hydrazoic acid) in the same wavelength region. The observed twohyphen;photon transitions are from theathinsp;1Dgr; state to 3pRydberg states. Transitions were also observed from theathinsp;1Dgr; state to thedthinsp;1Sgr;+state. The new state assignments are:fthinsp;1Pgr; (3psgr;) at 86thinsp;378 cmminus;1,gthinsp;1Dgr; (3ppgr;) at 88thinsp;140 cmminus;1, andhthinsp;1Sgr; (3ppgr;) at 89thinsp;531 cmminus;1. Rotational constants (BandD) and, where possible, vibrational spacings for the thirteen observed bands are also determined.