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Issue 35, 2011
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A theoretical and experimental study on translational and internal energies of H2O and OH from the 157 nm irradiation of amorphous solid water at 90 K

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Abstract

The photodesorption of H2O in its vibrational ground state, and of OH radicals in their ground and first excited vibrational states, following 157 nm photoexcitation of amorphous solid water has been studied using molecular dynamics simulations and detected experimentally by resonance-enhanced multiphoton ionization techniques. There is good agreement between the simulated and measured energy distributions. In addition, signals of H+ and OH+ were detected in the experiments. These are inferred to originate from vibrationally excited H2O molecules that are ejected from the surface by two distinct mechanisms: a direct desorption mechanism and desorption induced by secondary recombination of photoproducts at the ice surface. This is the first reported experimental evidence of photodesorption of vibrationally excited H2O molecules from water ice.

Graphical abstract: A theoretical and experimental study on translational and internal energies of H2O and OH from the 157 nm irradiation of amorphous solid water at 90 K

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Publication details

The article was received on 11 Apr 2011, accepted on 19 Jul 2011 and first published on 09 Aug 2011


Article type: Paper
DOI: 10.1039/C1CP21138B
Citation: Phys. Chem. Chem. Phys., 2011,13, 15810-15820
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    A theoretical and experimental study on translational and internal energies of H2O and OH from the 157 nm irradiation of amorphous solid water at 90 K

    S. Andersson, C. Arasa, A. Yabushita, M. Yokoyama, T. Hama, M. Kawasaki, C. M. Western and M. N. R. Ashfold, Phys. Chem. Chem. Phys., 2011, 13, 15810
    DOI: 10.1039/C1CP21138B

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