1. Energy-transfer processes in neon-hydrogen mixtures excited by electron beams.
- Author
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Morozov, A., Krücken, R., Ulrich, A., Wieser, J., and McCarthy, T.
- Subjects
CHARGE transfer ,ENERGY transfer ,ION exchange (Chemistry) ,HYDROGEN ,ELECTRON optics ,INTERMEDIATES (Chemistry) - Abstract
Energy- and charge-transfer processes in neon-hydrogen mixtures (500–1400 hPa neon and 0.001–3 hPa hydrogen partial pressures) excited by a pulsed low-energy (∼10 keV) electron beam were investigated using time-resolved spectroscopy. Time spectra of the hydrogen Lyman-α line, neon excimer emission (second continuum), and neon atomic lines (3p–3s transitions) were recorded. The time-integrated intensity of the Lyman-α emission was measured for the same range of gas mixtures. It is shown that direct energy transfer from Ne
2 * excimers and neon atoms in the four lowest excited states as well as recombination of H3 + ions are the main channels populating atomic hydrogen in the n=2 state. A rate constant of (4.2±1.4)×10-11 cm3 s-1 was obtained for the charge transfer from Ne2 + ions to molecular hydrogen. A lower limit for the depopulation rate constant of Ne2 * excimers by molecular hydrogen (combination of energy transfer and ionization) was found to be 1.0×10-10 cm3 s-1 . [ABSTRACT FROM AUTHOR]- Published
- 2005
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