Pressure and temperature-dependent quantum yields for the photodissociation of acetone between 279 and 327.5 nm

被引：75

作者：

Blitz, MA ^{[1
]}

Heard, DE

Pilling, MJ

Arnold, SR

Chipperfield, MP

机构：

[1] Univ Leeds, Dept Chem, Leeds LS2 9JT, W Yorkshire, England

[2] Univ Leeds, Sch Environm, Leeds LS2 9JT, W Yorkshire, England

来源：

GEOPHYSICAL RESEARCH LETTERS | 2004年 / 31卷 / 06期

基金：

英国自然环境研究理事会;

关键词：

D O I：

10.1029/2003GL018793

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

[1] The photodissociation of acetone has been studied over the wavelength (lambda) range 279-327.5 nm as a function of temperature (T) and pressure (p) using a spectroscopic method to monitor the acetyl (CH3CO) radical fragment. Above 310 nm the quantum yield (QY) is substantially smaller than previous measurements, and decreases with T. The QYs for production of CH3CO + CH3 and CH3 + CH3 + CO have been parameterised as a function of lambda, p and T and used to calculate the altitude dependence of the photolysis frequency. In the upper troposphere (UT) the acetone photolysis lifetime is a factor of 2.5-10 longer, dependent upon latitude and season, than if the previously recommended QYs are used.

引用

页码：1 / 5

页数：5

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