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

Stefan Andersson, Carina Arasa, Akihiro Yabushita, Masaaki Yokoyama, Tetsuya Hama, Masahiro Kawasaki, Colin M. Western, Michael N.R. Ashfold

Research output: Contribution to journalArticle

14 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)15810-15820
Number of pages11
JournalPhysical Chemistry Chemical Physics
Volume13
Issue number35
DOIs
Publication statusPublished - Sep 21 2011
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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