Near-UV photolysis cross sections of CH3OOH and HOCH2OOH determined via action spectroscopy

被引：32

作者：

Roehl, C. M. ^{[1
]}

Marka, Z.

Fry, J. L.

Wennberg, P. O.

机构：

[1] CALTECH, Div Geol & Planetary Sci, Pasadena, CA 91125 USA

[2] CALTECH, Arthur Amos Noyes Lab Chem Phys, Pasadena, CA 91125 USA

[3] CALTECH, Div Engn & Appl Sci, Pasadena, CA 91125 USA

来源：

ATMOSPHERIC CHEMISTRY AND PHYSICS | 2007年 / 7卷

关键词：

ABSORPTION; VAPOR; H2O2; OH; MECHANISM; RADICALS; KINETICS; HO2NO2; HOBR; NM;

D O I：

10.5194/acp-7-713-2007

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Knowledge of molecular photolysis cross sections is important for determining atmospheric lifetimes and fates of many species. A method and laser apparatus for measurement of these cross sections in the near-ultraviolet (UV) region is described. The technique is based on action spectroscopy, where the yield of a photodissociation product ( in this case OH) is measured as a function of excitation energy. For compounds yielding OH, this method can be used to measure near-UV photodissociation cross section as low as 10(-23) cm(2) molecule(-1). The method is applied to determine the photodissociation cross sections for methyl hydroperoxide (CH3OOH; MHP) and hydroxymethyl hydroperoxide (HOCH2OOH; HMHP) in the 305 - 365 nm wavelength range. The measured cross sections are in good agreement with previous measurements of absorption cross sections.

引用

页码：713 / 720

页数：8

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