Quenching of NO(D 2Σ+, E 2Σ+) formed by UV photodissociation of NOCl

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Abstract
The photodissociation of NOCl at 193 nm has resulted in vibrationally excited NO which was subsequently excited to the D(v = 5) and E(v = 0) states. The resulting fluorescence at 160–180 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 NO* by Ne, Ar, Kr, and Xe were determined to be kNe = (6.4±1.6)×10−11 cm3 s−1, kAr = (1.7±0.4)×10−10 cm3 s−1, kKr = (6.6±1.7)×10−10 cm3 s−1, and kXe = (1.0±0.2)×10−9 cm3 s−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 = (2.7±0.6)×10−9 cm3 s−1 and kCl = (2.1±0.5)×10−9 cm3 s−1.