title: Energy-transfer processes in neon-hydrogen mixtures excited by electron beams.
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 (approximately 10 keV) electron beam were investigated using time-resolved spectroscopy. Time spectra of the hydrogen Lyman-alpha line, neon excimer emission (second continuum), and neon atomic lines (3p-3s transitions) were recorded. The time-integrated intensity of the Lyman-alpha 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)x10(-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 Ne*2 excimers by molecular hydrogen (combination of energy transfer and ionization) was found to be 1.0 x 10(-10) cm3 s(-1).
authors.affiliation: Fakultät für Physik E12, Technische Universität München, 85748 Garching, Germany. andrei.morozov@ph.tum.de
authors.forename: A
authors.initials: A
authors.lastname: Morozov
authors.forename: R
authors.initials: R
authors.lastname: Krücken
authors.forename: A
authors.initials: A
authors.lastname: Ulrich
authors.forename: J
authors.initials: J
authors.lastname: Wieser
authors.forename: T
authors.initials: T
authors.lastname: McCarthy