Jump to main content
Jump to site search

Volume 168, 2014
Previous Article Next Article

Reaction kinetics and isotope effect of water formation by the surface reaction of solid H2O2 with H atoms at low temperatures

Author affiliations

Abstract

We performed laboratory experiments on the formation of water and its isotopologues by surface reactions of hydrogen peroxide (H2O2) with hydrogen (H) atoms and their deuterated counterparts (D2O2, D) at 10–30 K. High-purity H2O2 (>95%) was prepared in situ by the codeposition of molecular oxygen and H atoms at relatively high temperatures (45–50 K). We determined that the high-purity H2O2 solid reacts with both H and deuterium (D) atoms at 10–30 K despite the large activation barriers (∼2000 K). Moreover, the reaction rate for H atoms is approximately 45 times faster than that for D atoms at 15 K. Thus, the observed large isotope effect indicates that these reactions occurred through quantum tunneling. We propose that the observed HDO/H2O ratio in molecular clouds might be a good tool for the estimation of the atomic D/H ratio in those environments.

Back to tab navigation

Publication details

The article was received on 26 Nov 2013, accepted on 17 Jan 2014 and first published on 22 May 2014


Article type: Paper
DOI: 10.1039/C3FD00112A
Faraday Discuss., 2014,168, 185-204
  • Open access: Creative Commons BY license
  •   Request permissions

    Reaction kinetics and isotope effect of water formation by the surface reaction of solid H2O2 with H atoms at low temperatures

    Y. Oba, K. Osaka, N. Watanabe, T. Chigai and A. Kouchi, Faraday Discuss., 2014, 168, 185
    DOI: 10.1039/C3FD00112A

    This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. Material from this article can be used in other publications provided that the correct acknowledgement is given with the reproduced material.

    Reproduced material should be attributed as follows:

    • For reproduction of material from NJC:
      [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the Centre National de la Recherche Scientifique (CNRS) and the RSC.
    • For reproduction of material from PCCP:
      [Original citation] - Published by the PCCP Owner Societies.
    • For reproduction of material from PPS:
      [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the European Society for Photobiology, the European Photochemistry Association, and RSC.
    • For reproduction of material from all other RSC journals:
      [Original citation] - Published by The Royal Society of Chemistry.

    Information about reproducing material from RSC articles with different licences is available on our Permission Requests page.

Search articles by author

Spotlight

Advertisements