Rotational level dependence of the electronic quenching of NH2Atilde; by helium

摘要

The rotational level dependence of the electronic quenching of theAtilde;2A1state of the NH2radical is investigated by timehyphen;resolved laserhyphen;induced fluorescence. Quenching of sum;(0,9,0) is found to increase monotonically with rotational level from 2times;10minus;11cm3sminus;1forNrsquo;=0 to 7times;10minus;11cm3sminus;1forNrsquo;=7. Measurements on the neighboring sum;(0,7,0), Pgr;(0,8,0), and Pgr;(0,10,0) vibronic levels show no significant rotational level dependence. The behavior in sum;(0,9,0) cannot be satisfactorily explained by either molecular collision dynamics or by state mixing.