ULTRAVIOLET-ABSORPTION SPECTRA AND KINETICS OF ACETONYL AND ACETONYLPEROXY RADICALS

被引：44

作者：

COX, RA ^{[1
]}

MUNK, J ^{[1
]}

NIELSEN, OJ ^{[1
]}

PAGSBERG, P ^{[1
]}

RATAJCZAK, E ^{[1
]}

机构：

[1] RISO NATL LAB,DEPT CHEM,DK-4000 ROSKILDE,DENMARK

来源：

CHEMICAL PHYSICS LETTERS | 1990年 / 173卷 / 2-3期

关键词：

D O I：

10.1016/0009-2614(90)80079-S

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：

Acetonyl radicals and acetonylperoxy radicals were produced by pulse radiolysis of gas mixtures with varying concentrations of CH3COCH3 and O2 in 1 atm of SF6 to initiate the reactions (1) F+CH3COCH3→HF+CH3COCH2, (2) 2CH3COCH2 → products, (3) CH3COCH2+O2(+M) → CH3COCH2O2(+M) and (4) 2CH3COCH2O2 → products. The ultraviolet absorption spectrum of the acetonyl radical is composed of a fairly weak band centered at 315 nm and a stronger band in the range of 200-250 nm. The absorption cross section has been determined, σ(310 nm) = (8.73 ± 0.50) × 10-19 cm2 molecule-1. The values k2=(4.8 ± 0.4) × 10-11, k3=(1.5 ± 0.3) × 10-12 and k4=(8.3 ± 1.6) × 10-12 cm3 molecule-1 s-1 at 298 K were derived by computer modelling of the observed kinetic features. © 1990.

引用

页码：206 / 210

页数：5

共 16 条

[1] ACETYL RADICAL STUDIED BY FLASH-PHOTOLYSIS AND KINETIC SPECTROSCOPY [J].