Branching ratio for the H+NCO channel in the 193 nm photodissociation of HNCO

被引：35

作者：

Brownsword, RA ^{[1
]}

Laurent, T ^{[1
]}

Vatsa, RK ^{[1
]}

Volpp, HR ^{[1
]}

Wolfrum, J ^{[1
]}

机构：

[1] UNIV HEIDELBERG,INST PHYS CHEM,D-69120 HEIDELBERG,GERMANY

来源：

CHEMICAL PHYSICS LETTERS | 1996年 / 249卷 / 3-4期

关键词：

VACUUM-ULTRAVIOLET; PHOTO-DISSOCIATION; LASER PHOTOLYSIS; NITRIC-OXIDE; EXHAUST-GAS; HYDROGEN; DISTRIBUTIONS; REDUCTION; KRYPTON; ACID;

D O I：

10.1016/0009-2614(95)01409-8

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The H atom quantum yield phi(H) and the average product translational energy were determined for the HNCO --> H(S-2) + NCO(X(2)II) photodissociation channel at room temperature for a photolysis wavelength of 193 nm. HNCO was photolyzed using an ArF excimer laser and nascent H atoms were detected by vacuum-UV-laser-induced fluorescence at the Lyman-alpha transition. With a calibration method using HCl photolysis as a source of well-defined H atom concentrations, a value of phi(H) = 0.20 +/- 0.04 for the H atom quantum yield was measured. From H atom Doppler profiles, measured under single collision conditions, the fraction f(T) of the available energy released as product translational energy was determined to be f(T)(H + NCO)= 0.69 +/- 0.09.

引用

页码：162 / 166

页数：5

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