Quantum yield for H atom formation in the methane dissociation after photoexcitation at the Lyman-alpha (121.6 nm) wavelength

被引：35

作者：

Brownsword, RA ^{[1
]}

Hillenkamp, M ^{[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 | 1997年 / 266卷 / 1-2期

关键词：

D O I：

10.1016/S0009-2614(96)01526-6

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 gas-phase photodissociation dynamics of methane after excitation at the Lyman-alpha wavelength (121.6 nm) was investigated under collision-free conditions at room temperature. Narrow-band tunable Lyman-cr laser radiation was generated by the resonant third-order sum-difference frequency conversion of pulsed-dye laser radiation and used both to photodissociate the parent molecules and to detect the photolytically produced hydrogen atoms via (2p(2)P<--1s(2)S) laser-induced fluorescence. H atom Doppler profiles were recorded and the absolute quantum yield for H atom formation, Phi(H) = (0.47 +/- 0.11), was determined by means of a photolytic calibration method where the Lyman-alpha photolysis of H2O was used as a reference source of well-defined H atom concentrations, This value will be used in combination with previous results from H-2 and CH yield measurements to estimate the relative importance of the different product pathways in the CH4 photodissociation.

引用

页码：259 / 266

页数：8

共 35 条

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