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 language | English |
|---|---|
| Article number | 224512 |
| Journal | Journal of Chemical Physics |
| Volume | 131 |
| Issue number | 22 |
| DOIs | |
| Publication status | Published - Dec 28 2009 |
| Externally published | Yes |
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All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry
Cite this
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 journal › Article
}
TY - JOUR
T1 - Translational and internal energy distributions of methyl and hydroxyl radicals produced by 157 nm photodissociation of amorphous solid methanol
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.
PY - 2009/12/28
Y1 - 2009/12/28
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=72449199412&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=72449199412&partnerID=8YFLogxK
U2 - 10.1063/1.3259877
DO - 10.1063/1.3259877
M3 - Article
C2 - 20001062
AN - SCOPUS:72449199412
VL - 131
JO - Journal of Chemical Physics
JF - Journal of Chemical Physics
SN - 0021-9606
IS - 22
M1 - 224512
ER -