Carbon monoxide entrapment in interstellar ice analogs

被引：181

作者：

Collings, MP ^{[1
]}

Dever, JW ^{[1
]}

Fraser, HJ ^{[1
]}

McCoustra, MRS ^{[1
]}

Williams, DA ^{[1
]}

机构：

[1] Univ Nottingham, Sch Chem, Nottingham NG7 2RD, England

来源：

ASTROPHYSICAL JOURNAL | 2003年 / 583卷 / 02期

关键词：

astrochemistry; infrared : ISM; ISM : lines and bands; ISM : molecules; line : profiles; methods : laboratory;

D O I：

10.1086/345389

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The adsorption and desorption of CO on and from amorphous H2O ice at astrophysically relevant temperatures has been studied using temperature programmed desorption (TPD) and reflection-absorption infrared spectroscopy (RAIRS). Solid CO is able to diffuse into the porous structure of H2O at temperatures as low as 15 K. When heated, a phase transition between two forms of amorphous H2O ice occurs over the 30-70 K temperature range, causing the partial collapse of pores and the entrapment of CO. Trapped CO is released during crystallization and desorption of the H2O film. This behavior may have a significant impact on both gas-phase and solid-phase chemistry in a variety of interstellar environments.

引用

页码：1058 / 1062

页数：5

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