Electron impact ionization and dissociation probed by laser induced fluorescence.
Item
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Title
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Electron impact ionization and dissociation probed by laser induced fluorescence.
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Identifier
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AAI9946130
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identifier
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9946130
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Creator
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Abramzon, Nina.
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Contributor
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Adviser: Kurt Becker
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Date
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1999
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Language
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English
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Publisher
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City University of New York.
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Subject
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Physics, Molecular | Physics, Atomic | Physics, Optics
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Abstract
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A combination of electron scattering and laser-induced fluorescence (LIF) techniques has been employed in the direct experimental determination of the absolute N2+(x2Sigmag) ionization cross section as a function of electron energy from threshold to 200 eV. Electron impact on N2 produces N2+ ground-state ions which are detected by pumping the (X2Sigma g+ → B2Sigmau +) (0,0) vibrational transition at 391 nm with a tunable dye laser and detecting the subsequent LIF of the (B2Sigmau + → X2Sigmag+) (0,1) vibrational transition at 428 nm. LIF spectra, obtained at different electron energies yield the relative N2+ (X) cross section which is put on an absolute scale by independent calibration to the well-known "benchmark" cross section for the production of He atoms in the 2s 3S state by electron impact at 20.4 eV on He in the 1s 1S ground state. Our results are compared with the recent measurement by Doering and Yang (J. Geophysical Research, 102, 9683 (1997)) obtained from electron-electron coincidence (e,2e) experiments at 100 eV and with a recent estimate by Van Zyl and Pendelton (J. Geophysical Research, 100, 23755(1995)).
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
