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Journal of Chemical Physics / Volume 134 / Issue 8 / ARTICLES / Condensed Phase Dynamics, Structure, and Thermodynamics: Spectroscopy, Reactions, and Relaxation

J. Chem. Phys. 134, 084504 (2011); http://dx.doi.org/10.1063/1.3532087 (7 pages)

Water formation by surface O3 hydrogenation

C. Romanzin1, S. Ioppolo2, H. M. Cuppen2,3, E. F. van Dishoeck3,4, and H. Linnartz2

1LPMAA, Université Pierre et Marie Curie, Paris, France
2Sackler Laboratory for Astrophysics, Leiden Observatory, Leiden University, P.O. Box 9513, 2300 RA Leiden, The Netherlands
3Leiden Observatory, Leiden University, P.O. Box 9513, 2300 RA Leiden, The Netherlands
4Max-Planck-Institut für Extraterrestrische Physik, Giessenbachstrasse 1, D-85741 Garching, Germany

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(Received 14 September 2010; accepted 4 December 2010; published online 24 February 2011)

Three solid state formation routes have been proposed in the past to explain the observed abundance of water in space: the hydrogenation reaction channels of atomic oxygen (O + H), molecular oxygen (O2 + H), and ozone (O3 + H). New data are presented here for the third scheme with a focus on the reactions O3 + H, OH + H and OH + H2, which were difficult to quantify in previous studies. A comprehensive set of H/D-atom addition experiments is presented for astronomically relevant temperatures. Starting from the hydrogenation/deuteration of solid O3 ice, we find experimental evidence for H2O/D2O (and H2O2/D2O2) ice formation using reflection absorption infrared spectroscopy. The temperature and H/D-atom flux dependence are studied and this provides information on the mobility of ozone within the ice and possible isotope effects in the reaction scheme. The experiments show that the O3 + H channel takes place through stages that interact with the O and O2 hydrogenation reaction schemes. It is also found that the reaction OH + H2 (OH + H), as an intermediate step, plays a prominent (less efficient) role. The main conclusion is that solid O3 hydrogenation offers a potential reaction channel for the formation of water in space. Moreover, the nondetection of solid ozone in dense molecular clouds is consistent with the astrophysical picture in which O3 + H is an efficient process under interstellar conditions.

© 2011 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. EXPERIMENTAL
  3. DATA ANALYSIS
  4. RESULTS AND DISCUSSION
    1. Temperature dependence
    2. H/D-atom flux dependence
    3. Possible reaction pathways
  5. CONCLUSION

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KEYWORDS and PACS

Keywords

association, atom-molecule reactions, hydrogen compounds, hydrogen neutral atoms, hydrogen neutral molecules, hydrogenation, ice, isotope effects, oxygen, ozone, water

PACS

  • 82.30.Nr

    Association, addition, insertion, cluster formation

  • 82.30.Cf

    Atom and radical reactions; chain reactions; molecule-molecule reactions

  • 82.20.Tr

    Kinetic isotope effects including muonium

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3532087

PUBLICATION DATA

ISSN

0021-9606 (print)  
1089-7690 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
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