PHOTODISSOCIATION OF ACETALDEHYDE STUDIED BY PHOTOFRAGMENT EXCITATION SPECTROSCOPY IN A SUPERSONIC FREE JET

被引：42

作者：

KONO, T ^{[1
]}

TAKAYANAGI, M ^{[1
]}

NISHIYA, T ^{[1
]}

HANAZAKI, I ^{[1
]}

机构：

[1] INST MOLEC SCI,OKAZAKI,AICHI 444,JAPAN

来源：

CHEMICAL PHYSICS LETTERS | 1993年 / 201卷 / 1-4期

关键词：

D O I：

10.1016/0009-2614(93)85051-O

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 photofragment excitation spectrum was obtained for the photochemical reaction, CH3CHO*-->CH3+HCO, in a supersonic free jet, by monitoring the B<--X transition of the HCO radical. The collision-free measurements fix the threshold for the dissociation at 320.5 nm, corresponding to a barrier height of 51.9 kJ mol-1 on the T1 surface of acetaldehyde. The decrease of the fluorescence quantum yield of acetaldehyde between 320.5 and 317.5 nm was found to be accompanied by an increase of the HCO yield, which was ascribed to the energy-dependent dissociation rate above the barrier.

引用

页码：166 / 170

页数：5

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