Jump to main content
Jump to site search

Issue 35, 2011
Previous Article Next Article

Experimental studies of surface reactions among OH radicals that yield H2O and CO2 at 40–60 K

Author affiliations

Abstract

We investigated the OH-related formation routes of two astrophysically important molecules, H2O and CO2, under relatively warm astrophysical conditions. OH radicals, together with other neutral species such as H, O, H2, and O2, were produced in H2O microwave-discharge plasma and cooled to 100 K before being deposited on an Al substrate at 40–60 K. H2O formed at 40 and 50 K, but not at 60 K. Taking the experimental conditions into account, a possible route of H2O formation is via reactions involving OH + OH, which yield H2O2 as the main reaction product. The present study is the first to show experimentally that surface reactions of two OH radicals can yield H2O at low temperatures. The products' branching ratio was 0.2 and 0.8 for H2O and H2O2, respectively. When CO was co-deposited with neutral species that formed in the H2O plasma, CO2 was formed at 40–60 K. H2CO3 formed at 40 and 50 K. The present results may suggest that chemical reactions related to OH radicals are effective at yielding various molecules in relatively warm astrophysical environments, such as protostars.

Graphical abstract: Experimental studies of surface reactions among OH radicals that yield H2O and CO2 at 40–60 K

Back to tab navigation

Publication details

The article was received on 03 Mar 2011, accepted on 09 Jun 2011 and first published on 05 Jul 2011


Article type: Paper
DOI: 10.1039/C1CP20596J
Phys. Chem. Chem. Phys., 2011,13, 15792-15797

  •   Request permissions

    Experimental studies of surface reactions among OH radicals that yield H2O and CO2 at 40–60 K

    Y. Oba, N. Watanabe, A. Kouchi, T. Hama and V. Pirronello, Phys. Chem. Chem. Phys., 2011, 13, 15792
    DOI: 10.1039/C1CP20596J

Search articles by author

Spotlight

Advertisements