Translational and internal energy distributions of methyl and hydroxyl radicals produced by 157 nm photodissociation of amorphous solid methanol

Tetsuya Hama, Masaaki Yokoyama, Akihiro Yabushita, Masahiro Kawasaki, Piyumie Wickramasinghe, Wei Guo, Hans Peter Loock, Michael N.R. Ashfold, Colin M. Western

Research output: Contribution to journalArticle

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Abstract

Methanol is typically observed within water-rich interstellar ices and is a source of interstellar organic species. Following the 157 nm photoexcitation of solid methanol at 90 K, desorbed CH3(v=0) and OH(v=0,1) radicals have been observed in situ, near the solid surface, using resonance-enhanced multiphoton ionization (REMPI) detection methods. Time-of-flight and rotationally resolved REMPI spectra of the desorbed species were measured, and the respective fragment internal energy and kinetic energy distributions were obtained. Photoproduction mechanisms for CH3 and OH radicals from solid methanol are discussed. The formation of O (1D and 3P) atoms and H2O was investigated, but the yield of these species was found to be negligible. CH3 products arising following the photoexcitation of water-methanol mixed ice showed similar kinetic and internal energy distributions to those from neat methanol ice.

Original languageEnglish
Article number224512
JournalJournal of Chemical Physics
Volume131
Issue number22
DOIs
Publication statusPublished - Dec 28 2009
Externally publishedYes

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Photodissociation
hydroxyl radicals
internal energy
Hydroxyl Radical
photodissociation
Methanol
energy distribution
methyl alcohol
Ice
ice
Photoexcitation
photoexcitation
Ionization
kinetic energy
energy
ionization
Water
photoproduction
solid surfaces
Kinetic energy

All Science Journal Classification (ASJC) codes

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

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Translational and internal energy distributions of methyl and hydroxyl radicals produced by 157 nm photodissociation of amorphous solid methanol. / Hama, Tetsuya; Yokoyama, Masaaki; Yabushita, Akihiro; Kawasaki, Masahiro; Wickramasinghe, Piyumie; Guo, Wei; Loock, Hans Peter; Ashfold, Michael N.R.; Western, Colin M.

In: Journal of Chemical Physics, Vol. 131, No. 22, 224512, 28.12.2009.

Research output: Contribution to journalArticle

Hama, Tetsuya ; Yokoyama, Masaaki ; Yabushita, Akihiro ; Kawasaki, Masahiro ; Wickramasinghe, Piyumie ; Guo, Wei ; Loock, Hans Peter ; Ashfold, Michael N.R. ; Western, Colin M. / Translational and internal energy distributions of methyl and hydroxyl radicals produced by 157 nm photodissociation of amorphous solid methanol. In: Journal of Chemical Physics. 2009 ; Vol. 131, No. 22.
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AU - Hama, Tetsuya

AU - Yokoyama, Masaaki

AU - Yabushita, Akihiro

AU - Kawasaki, Masahiro

AU - Wickramasinghe, Piyumie

AU - Guo, Wei

AU - Loock, Hans Peter

AU - Ashfold, Michael N.R.

AU - Western, Colin M.

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