Structural reorganization on amorphous ice films below 120 K revealed by near-thermal (~1 eV) ion scattering

Cyriac, Jobin ; Pradeep, T. (2008) Structural reorganization on amorphous ice films below 120 K revealed by near-thermal (~1 eV) ion scattering Journal of Physical Chemistry C, 112 (13). pp. 5129-5135. ISSN 1932-7447

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Official URL: http://pubs.acs.org/doi/abs/10.1021/jp7116467

Related URL: http://dx.doi.org/10.1021/jp7116467

Abstract

Topmost layers of amorphous ice undergo a structural transformation before the onset of crystallization and well before the premelting transitions. Ultralow-energy (~1 eV) mass-selected Ar+ scattering has been used to detect this structural change. The transformation is manifested in the form of drastic changes in the scattered ion intensity in the ≤2 eV collision energy range. The changes are limited to the first few monolayers as larger thicknesses produce no additional effects. The technique becomes chemically sensitive but insensitive to the morphology and structure as the energy is increased above 3 eV. A similar behavior is observed with He+, Kr+, and a polyatomic ion, CH3+. Experiments revealed that the structural changes occurred only on amorphous ice and no such change occurred on crystalline ice. H2O and D2O ices behave similarly.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
ID Code:27486
Deposited On:10 Dec 2010 12:13
Last Modified:14 May 2012 05:51

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