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Hydrogen atoms in solid xenon: Trapping site structure, distribution, and stability as revealed by EPR studies in monoisotopic and isotopically enriched xenon matricesстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 11 сентября 2012 г.
- Авторы: Feldman Vladimir I., Sukhov Fedor F., Orlov Aleksei Yu
- Журнал: Journal of Chemical Physics
- Том: 128
- Номер: 21
- Год издания: 2008
- Издательство: AIP Publishing
- Местоположение издательства: United States
- DOI: 10.1063/1.2933366
- Аннотация: Trapping and decay of hydrogen atoms generated by fast electron irradiation of solid xenon doped with small hydrogen-containing molecules (acetylene, water) were studied by EPR using monoisotopic (136)Xe matrix (I=0) and highly isotopically enriched (129)Xe matrix (I=1/2). It was found that more than 99% of H atoms observed by EPR are initially trapped in the octahedral interstitial trapping sites, whereas initial population of the substitutional traping sites is very small (less than 1%). The (129)Xe hyperfine coupling tensor parameters for major trapping site were determined from direct measurements in a (136)Xe matrix doped with small amount of (129)Xe: A(0) ((129)Xe)=-92.1 MHz and B((129)Xe)=-22 MHz. Final proof for the trapping site structure was obtained from comparison between experiment and simulation for the highly enriched (129)Xe matrix. The mean interspin distance of approximately 4 nm was estimated from the EPR signal linewidth in a (136)Xe matrix, the hydrogen atom loss upon irradiation being negligible at low doses. Decay of trapped H atoms occurring at 38-45 K leads to population (or creation) of metastable traps of lower symmetry. (C) 2008 American Institute of Physics.
- Добавил в систему: Фельдман Владимир Исаевич