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Investigation of H−Production in Plasma of DC Glow Dischargeстатья
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: 19 июля 2013 г.
- Авторы: Belostotsky S.G., Lopaev D.V., Rakhimova T.V.
- Журнал: Journal of Physics: Conference Series
- Том: 44
- Год издания: 2006
- Издательство: IOP Publishing
- Местоположение издательства: [Bristol, UK], England
- Первая страница: 162
- Последняя страница: 168
- DOI: 10.1088/1742-6596/44/1/022
- Аннотация: The laser photodetachment technique was applied to investigate the negative ion dynamics in the positive column of a pure hydrogen dc glow discharge at pressures P = 0.1 - 3 Torr. Upon the discharge current modulation, the negative ion H- concentration decayed with the characteristic loss time of hydrogen H(1s2S) atom concentration. The evolution of H atom concentration was investigated by the time-resolved actinometry. The axial electric field was measured by double probe technique. The analysis of the experimental data, i.e. the dependencies of H- and H concentrations as well as reduced electric field on the discharge parameters (discharge current and pressure), allowed us to determine the rate constant of H- production in the discharge, where vibrational excitation and reactions with atoms H greatly influence upon H- production and loss processes. The main processes, which contribute to H- production, are discussed in detail. The vibrational excitation of H2 is shown to increase the rate of dissociative attachment essentially not only via the excitation of the well-known lowthreshold (eth≈3 eV) resonance of H2-(X2∑u+), but also via the excitation of the high-threshold resonances of H2-(2∑g+ (eth≈6 eV), 2Πg, 2Πu (eth≈8-13 eV) etc). Detailed analysis of dissociative attachment via high-threshold resonances allowed us to describe experimental data in the whole range of E/N being investigated, whereas taking any other mechanisms into account (attachment to Rydberg states of H2 etc) failed to do that.
- Добавил в систему: Лопаев Дмитрий Викторович