PHOTOLYSIS OF METHYL VINYL KETONE AT 193.3 NM - QUANTUM YIELD DETERMINATIONS OF METHYL AND VINYL RADICALS

被引：52

作者：

FAHR, A

BRAUN, W

LAUFER, AH

机构：

[1] Chemical Kinetics and Thermodynamics Division, National Institute of Standard and Technology, Gaithersburg

[2] Chemical Science Division, Office of Basic Energy Sciences, U.S. Department of Energy, Washington

来源：

JOURNAL OF PHYSICAL CHEMISTRY | 1993年 / 97卷 / 08期

关键词：

D O I：

10.1021/j100110a007

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 primary dissociation processes in the photolysis of methyl vinyl ketone (MVK) at 193.3 nm have been investigated. A quantum yield of close to unity for the formation of both CH3 and C2H3 radicals has been determined using real-time absorption data in conjunction with gas chromatographic analysis of final products. Detailed kinetic modeling of the system indicates a rate constant of (1.5 +/- 0.3) X 10(-10) cm3 molecule-1 s-1 for the cross-combination of methyl with vinyl radicals. A combination/disproportionation ratio for the vinyl-vinyl system of 3.2 +/- 0.7 was obtained. The ultraviolet absorption spectrum and absorption cross-sections of methyl vinyl ketone over the wavelength range from 160 to 200 nm were measured.

引用

页码：1502 / 1506

页数：5

共 16 条

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