Radiation chemistry of H2O+O2 ices

被引：31

作者：

Cooper, Paul D. ^{[1
]}

Moore, Marla H. ^{[1
]}

Hudson, Reggie L. ^{[2
]}

机构：

[1] NASA, Goddard Space Flight Ctr, Astrochem Branch, Greenbelt, MD 20771 USA

[2] Eckerd Coll, Dept Chem, St Petersburg, FL 33711 USA

来源：

ICARUS | 2008年 / 194卷 / 01期

基金：

美国国家航空航天局;

关键词：

ices; IR spectroscopy; satellites; composition; Europa; Ganymede; enceladus;

D O I：

10.1016/j.icarus.2007.10.002

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The chemistry and spectroscopy of proton-irradiated H2O + O-2 ices have been investigated in relation to the production of oxidants in icy satellite surfaces. Hydrogen peroxide (H2O2), ozone (O-3), and the hydroperoxy (HO2) and hydrogen trioxide (HO3) radicals have all been observed, and their temperature and dose dependent production trends have been measured. We find that O-2 aggregates form during the growth of H2O + O-2 ice films, and the presence of these aggregates greatly affects the HO2 and H2O2 yields. In addition, we have found that the position of the spectral maximum of the v(3) vibration of O-3 shifts with ice composition, giving an indication of the degree of dispersion of O-3 molecules within the ice. We discuss the relevance of these measurements to icy satellite surfaces. (c) 2007 Elsevier Inc. All rights reserved.

引用

页码：379 / 388

页数：10

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