在100 K温度下，对吸附在冰上的硝酸盐进行光辐照时，直接观测从水冰表面喷射出的羟基自由基。

Direct observation of OH radicals ejected from water ice surface in the photoirradiation of nitrate adsorbed on ice at 100 K.

作者信息

Yabushita Akihiro, Iida Daisuke, Hama Tetsuya, Kawasaki Masahiro

机构信息

Department of Molecular Engineering, Kyoto University, Kyoto 615-8510, Japan.

出版信息

J Phys Chem A. 2008 Oct 9;112(40):9763-6. doi: 10.1021/jp804622z.

DOI:10.1021/jp804622z

Abstract

Production of gaseous OH radicals in the 248-350 nm photoirradiation of NO3(-) doped on amorphous ice at 100 K was monitored directly by using resonance-enhanced multiphoton ionization. The translational energy distribution of the OH product was represented by a Maxwell-Boltzmann energy distribution with the translational temperature of 3250 +/- 250 K. The rotational temperature was estimated to be 175 +/- 25 K. We have confirmed that the OH production should be attributed to the secondary photolysis of H2O2 produced on ice surface on the basis of the results of controlled photolysis experiments for H2O2 doped on ice surface.

摘要

在100 K下，通过共振增强多光子电离直接监测了掺杂在非晶冰中的硝酸根离子在248 - 350 nm光照射下气态羟基自由基的产生。羟基产物的平动能量分布由平动温度为3250±250 K的麦克斯韦-玻尔兹曼能量分布表示。转动温度估计为175±25 K。基于对掺杂在冰表面的过氧化氢进行的受控光解实验结果，我们证实了羟基的产生应归因于冰表面产生的过氧化氢的二次光解。

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