LiH emission spectrum from the glow discharge in a heat-pipe oven
| Autor: | Hrvoje Skenderović, Goran Pichler, Ticijana Ban |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
Glow discharge
education.field_of_study Acoustics and Ultrasonics Population chemistry.chemical_element Rotational temperature Condensed Matter Physics Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry Excited state Electric discharge Lithium Plasma heat-pipe oven LiH Emission spectrum Atomic physics education Helium |
| Zdroj: | Journal of Physics D: Applied Physics. 33:396-404 |
| ISSN: | 1361-6463 0022-3727 |
| DOI: | 10.1088/0022-3727/33/4/313 |
| Popis: | We investigated emission spectrum of LiH molecules from an electric discharge in a heat-pipe oven. The optimal conditions for the most intense LiH emission regarding the vapour pressures of helium, hydrogen and lithium were found to be 2.5 Torr, 8.5 Torr and 0.9 mTorr, respectively. The important role of helium gas in increasing the LiH emission intensity is described. The number density of the lithium atoms in the first excited state, Li(2p) and the LiH emission, was measured for different hydrogen pressures and currents through the discharge. We found that one part of the LiH molecules formed in the discharge is created in chemical quenching of excited lithium atoms by H2 . We performed the theoretical simulations for observed LiH A 1 + -X 1 + emission band. The rotational temperature and the population distribution of vibrational levels in the LiH A 1 + state were determined. We also describe the search for emission from the LiH C 1 + electronic state in the spectrum, which at present is unsuccessful. |
| Databáze: | OpenAIRE |
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