Absorption cross-section measurements of water vapour and oxygen at 185 nm.: Implications for the calibration of field instruments to measure OH, HO2 and RO2 radicals

被引：72

作者：

Creasey, DJ ^{[1
]}

Heard, DE ^{[1
]}

Lee, JD ^{[1
]}

机构：

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

来源：

GEOPHYSICAL RESEARCH LETTERS | 2000年 / 27卷 / 11期

关键词：

D O I：

10.1029/1999GL011014

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Absorption cross sections for oxygen and water vapour were measured using a low-pressure mercury lamp optically filtered to isolate the emission close to 184.9 nm. The cross-sections were determined for conditions typically used in the calibration of OH HO2, and RO2 field instruments that employ photolysis of water vapour as a radical source, and O-2 absorption as the actinometer for lamp nux. For water vapour, an absorption cross-section of 7.22 (+/- 0.22) x 10(-20) cm(2) molecule(-1) was determined at 25 degrees C, in excellent agreement with recent studies, but similar to 30% higher than the recommended value. The absorption cross-section for O-2 was found to vary with the O-2 column and the choice and operating current of the lamp, reinforcing the requirement that practitioners of OH HO2 and RO2 field measurements who calibrate by this method should measure effective O-2 cross-sections at frequent intervals under their particular field conditions.

引用

页码：1651 / 1654

页数：4

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