Quenching of NO(Dthinsp;2Sgr;+,Ethinsp;2Sgr;+) formed by UV photodissociation of NOCl

摘要

The photodissociation of NOCl at 193 nm has resulted in vibrationally excited NO which was subsequently excited to theD(v= 5) andE(v= 0) states. The resulting fluorescence at 160ndash;180 nm has been analyzed in terms of a kinetic model. Saturation of the photodissociation was observed at laser intensities above 2 MW/cm2. The quenching rate constants of NOast; by Ne, Ar, Kr, and Xe were determined to bekNe= (6.4plusmn;1.6)times;10minus;11cm3thinsp;sminus;1,kAr= (1.7plusmn;0.4)times;10minus;10cm3thinsp;sminus;1,kKr= (6.6plusmn;1.7)times;10minus;10cm3thinsp;sminus;1, andkXe= (1.0plusmn;0.2)times;10minus;9cm3thinsp;sminus;1. The quenching by NO and Cl was explained in terms of charge transfer mechanism and the corresponding rate constants were found to be:kNO= (2.7plusmn;0.6)times;10minus;9cm3thinsp;sminus;1andkCl= (2.1plusmn;0.5)times;10minus;9cm3thinsp;sminus;1.