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タイトル: | Translational and internal energy distributions of methyl and hydroxyl radicals produced by 157 nm photodissociation of amorphous solid methanol |
著者: | Hama, Tetsuya Yokoyama, Masaaki Yabushita, Akihiro Kawasaki, Masahiro Wickramasinghe, Piyumie Guo, Wei Loock, Hans-Peter Ashfold, Michael N. R. Western, Colin M. |
キーワード: | astrochemistry free radicals interstellar molecules organic compounds photodissociation photoexcitation photoionisation rotational states translational states vibrational states |
発行日: | Dec-2009 |
出版者: | American Institute of Physics |
誌名: | JOURNAL OF CHEMICAL PHYSICS |
巻: | 131 |
号: | 22 |
論文番号: | 224512 |
抄録: | 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. |
著作権等: | Copyright 2009 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in JOURNAL OF CHEMICAL PHYSICS 131, 224512 (2009) and may be found at http://link.aip.org/link/JCPSA6/v131/i22/p224512/s1 |
URI: | http://hdl.handle.net/2433/109880 |
DOI(出版社版): | 10.1063/1.3259877 |
PubMed ID: | 20001062 |
関連リンク: | http://link.aip.org/link/JCPSA6/v131/i22/p224512/s1 |
出現コレクション: | 学術雑誌掲載論文等 |
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