Detection of rovibrationally excited molecular hydrogen in the electronic ground state via synchrotron radiation

Bechu, S.; Aleiferis, S.; Bentounes, J.; Gavilan, L.; Shakhatov, V.A.; Bes, A.; Svarnas, P.; Mazouffre, S.; De Oliviera, N.; Engeln, R.; Lemaire, J.L.

Статья опубликована в высокорейтинговом журнале

Информация о цитировании статьи получена из Web of Science, Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 11 апреля 2017 г.

Авторы: Bechu S., Aleiferis S., Bentounes J., Gavilan L., Shakhatov V.A., Bes A., Svarnas P., Mazouffre S., De Oliviera N., Engeln R., Lemaire J.L.
Журнал: Applied Physics Letters
Том: 111
Номер: 7
Год издания: 2017
Издательство: AIP Publishing
Местоположение издательства: United States
Первая страница: 074103-0
Последняя страница: 074103-6
DOI: 10.1063/1.4985617
Аннотация: We describe an original setup named SCHEME (Source of exCited HydrogEn MolEcules) designed to study the recombinative desorption mechanisms of H atoms on a surface by means of high-brilliance monochromatic synchrotron radiation (SR). H atoms are produced on electrically heated filaments under vacuum (in the absence of any discharge) and subsequently recombine on a surface to produce excited hydrogen molecules, namely, H2(v″, J″). Once these levels are produced, they are probed in the vacuum chamber with 5–40 eV (248–31 nm) SR-photons. A preliminary test with Krypton has demonstrated the feasibility of SCHEME to obtain simultaneously VUV-synchrotron radiation induced fluorescence and VUV-absorption signals with room-temperature gas. In order to evaluate the hydrogen molecule dissociation induced by the heated filaments, the absolute density of H atoms has been measured by VUV-absorption. At 1800 K and 100 mTorr, we estimated a dissociation degree of 10−4, which corresponds to an absolute density of 1.8×1017 m⁻³. VUV-absorption spectroscopy is shown to be a valuable tool to detect H2(v″, J″) molecules up to v″ = 3. Possible improvements of the experimental setup, to detect higher v″ levels, are suggested in the end of this paper
Добавил в систему: Лебедев Юрий Анатольевич

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Detection of rovibrationally excited molecular hydrogen in the electronic ground state via synchrotron radiationстатья

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