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Excited-Atom Production by Electron Bombardment of Alkali-Halides

Published online by Cambridge University Press:  28 February 2011

R. E. Walkup ,
Ph. Avouris  and
A. P. Ghosh
R. E. Walkup
Affiliation:
IBM Thomas J. Watson Research Center, P.O. Box 218, Yorktown Heights, N.Y. 10598
Ph. Avouris
Affiliation:
IBM Thomas J. Watson Research Center, P.O. Box 218, Yorktown Heights, N.Y. 10598
A. P. Ghosh
Affiliation:
IBM Thomas J. Watson Research Center, P.O. Box 218, Yorktown Heights, N.Y. 10598
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Abstract

We present experimental results which suggest a new mechanism for the production of excited atoms and ions by electron bombardment of alkali-halides. Doppler shift measurements show that the electronically excited atoms have a thermal velocity distribution in equilibrium with the surface temperature. Measurements of the absolute yield of excited atoms, the distribution of population among the excited states, and the dependence of yield on incident electron current support a model in which excited atoms are produced by gas-phase collisions between desorbed ground-state atoms and secondary electrons. Similarly, gas-phase ionization of ground-state neutrals by secondary electrons accounts for a substantial portion of the positive ions produced by electron bombardment of alkali-halides.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 75: Symposium B – Photon, Beam, and Plasma Stimulated Chemical Processes at Surfaces , 1986 , 599
Copyright
Copyright © Materials Research Society 1987

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