Vibrational distribution of N2(+)A2 πu from 100-eV electron impact on N2

Details Vibrational distribution of N2(+)A2 πu from 100-eV electron impact on N2 Vibrational distribution of N2(+)A2 πu from 100-eV electron impact on N2

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....99.3931d&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. A3, p. 3931-3933

Physics

6

Electron Impact, Near Infrared Radiation, Nitrogen, Spectral Energy Distribution, Vibrational Spectra, Energy Dissipation, Molecular Excitation, Molecular Spectroscopy

Scientific paper

Measurements of the electron excitation of the Meinel band system of N2(+) produced by electron impact on N2 have been hampered by the long lifetime of the N2(+)A2Πu upper state, the spectroscopically inconvenient near-infrared region where the bands are located, as well as overlap by the N2 first positive system. In the present work, an experiment in which the scattered projectile electron and the low-energy secondary electron are detected in coincidence was used to allow the vibrational distribution of the A2Πu state produced by 100-eV electron impact on N2 to be determined directly in excitation without the need for optical measurements. The coincidence energy loss spectrum was measured for a typical secondary electron energy of 5 eV over a range of secondary electron ejection angles. The results of a band contour analysis show that the population of the nu' = 0-5 vibrational levels is consistent with that predicted by the Frank-Condon factors for ionization of N2 to the N2(+)A2Πu state.

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