UV photodissociation spectroscopy of oxidized undecylenic acid films

被引：28

作者：

Gomez, AL ^{[1
]}

Park, J ^{[1
]}

Walser, ML ^{[1
]}

Lin, A ^{[1
]}

Nizkorodov, SA ^{[1
]}

机构：

[1] Univ Calif Irvine, Dept Chem, Irvine, CA 92697 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY A | 2006年 / 110卷 / 10期

关键词：

D O I：

10.1021/jp0554442

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：

Oxidation of thin multilayered films of undecylenic (10-undecenoic) acid by gaseous ozone was investigated using a combination of spectroscopic and mass spectrometric techniques. The UV absorption spectrum of the oxidized undecylenic acid film is significantly red-shifted compared to that of the initial film. Photolysis of the oxidized film in the tropospheric actinic region ( lambda > 295 nm) readily produces formaldehyde and formic acid as gas-phase products. Photodissociation action spectra of the oxidized film suggest that organic peroxides are responsible for the observed photochemical activity. The presence of peroxides is confirmed by massspectrometric analysis of the oxidized sample and an iodometric test. Significant polymerization resulting from secondary reactions of Criegee radicals during ozonolysis of the film is observed. The data strongly imply the importance of photochemistry in aging of atmospheric organic aerosol particles.

引用

页码：3584 / 3592

页数：9

共 100 条

[1] Interactions of atmospheric trace gases with ice surfaces: Adsorption and reaction [J].