Experimental evidence for water formation on interstellar dust grains by hydrogen and oxygen atoms

被引：142

作者：

Dulieu, F. ^{[1
]}

Amiaud, L. ^{[1
]}

Congiu, E. ^{[1
]}

Fillion, J. -H. ^{[1
]}

Matar, E. ^{[1
]}

Momeni, A. ^{[1
]}

Pirronello, V. ^{[2
]}

Lemaire, J. L. ^{[1
]}

机构：

[1] Univ Cergy Pontoise, LERMA LAMAp, Observ Paris,CNRS, ENS,UPMC,UMR 8112, F-95000 Cergy Pontoise, France

[2] Univ Catania, Dipartimento Metodol Fis & Chim, I-95125 Catania, Sicily, Italy

来源：

ASTRONOMY & ASTROPHYSICS | 2010年 / 512卷

关键词：

astrochemistry; ISM: molecules; dust; extinction; methods: laboratory; molecular processes; AMORPHOUS SOLID WATER; SURFACE-REACTIONS; MOLECULAR CLOUDS; ICE; DESORPTION; MANTLES; IRRADIATION; MORPHOLOGY; GAS; H2O;

D O I：

10.1051/0004-6361/200912079

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Context. The synthesis of water is one necessary step in the origin and development of life. It is believed that pristine water is formed and grows on the surface of icy dust grains in dark interstellar clouds. Until now, there has been no experimental evidence whether this scenario is feasible or not on an astrophysically relevant template and by hydrogen and oxygen atom reactions. Aims. We present here the first experimental evidence of water synthesis by such a process on a realistic analogue of grain surface in dense clouds, i.e., amorphous water ice. Methods. Atomic beams of oxygen and deuterium are aimed at a porous water ice substrate (H2O) held at 10 K. Products are analyzed by the temperature-programmed desorption technique. Results. We observe the production of HDO and D2O, indicating that water is formed under conditions of the dense interstellar medium from hydrogen and oxygen atoms. This experiment opens up the field of a little explored complex chemistry that could occur on dust grains, which is believed to be the site where key processes lead to the molecular diversity and complexity observed in the Universe.

引用

页数：5

共 39 条

[1] Interaction of D2 with H2O amorphous ice studied by temperature-programed desorption experiments [J].