High resolution doublehyphen;resonance spectroscopy on Rydberg states of CO

摘要

The Rydberg statesLthinsp;1Pgr;(v=0),Lrsquo;thinsp;1Pgr;(v=1),Kthinsp;1Sgr;+(v=0),Wthinsp;1Pgr;(v=0), andWrsquo;thinsp;1Pgr;(v=2) have been studied in a 2+1 doublehyphen;resonance detection scheme with a resolution of 0.005 cmminus;1. Accurate molecular constants have been derived for these states. From the observed linewidths of individual rotational transitions, predissociation rates for the Rydberg states have been deduced. For the first time a clearJande/fdependence for the predissociation of CO has been observed. One of the states causing the observed predissociation could be identified as theDrsquo;thinsp;1Sgr;+state.