Formation of H2+ by ultra-low-energy collisions of protons with water ice surfaces

Bag, Soumabha ; McCoustra, Martin R. S. ; Pradeep, T. (2011) Formation of H2+ by ultra-low-energy collisions of protons with water ice surfaces The Journal of Physical Chemistry C, 115 (28). pp. 13813-13819. ISSN 1932-7447

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Official URL: http://pubs.acs.org/doi/abs/10.1021/jp203310k

Related URL: http://dx.doi.org/10.1021/jp203310k

Abstract

The molecular ion of dihydrogen (H2+) is produced by 1 eV collisions of protons (H+) on amorphous water ice surfaces. The reaction is also observed on crystalline ice surfaces, but with lower efficiency. Collisions of D+ on amorphous H2O and D2O ices yield D2+ on the former, subsequent to isotope exchange on the H2O surface. Ultra-low-energy collision-induced dihydrogen ion production is also observed from alkanol surfaces, with decreasing efficiency as the alkyl chain length increases. There is no corresponding reaction on solid hexane. This endothermic reaction, with implications for interstellar chemistry and plasma etching processes, is proposed to occur as a result of stabilization of the other reaction product, a hydroxyl radical (OH•), on water surfaces through hydrogen-bonding interactions with the surface. These results point to an interesting chemistry involving ultra-low-energy ions on molecular solids.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
ID Code:82410
Deposited On:10 Feb 2012 12:58
Last Modified:10 Feb 2012 12:58

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