Resonance phenomena in electron impact excitation of the fundamental vibrational modes of water

Absolute differential cross-sections for electron impact excitation of the bending (010) and unresolved stretching (100)+(001) vibrational modes of water (H 2O) are reported. The incident electron energy is E 0=7.5 eV and the scattered electron angular range 10°–120°. Significant angular structure i...

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Bibliographic Details
Published in:Chemical physics letters 2000-03, Vol.319 (5), p.701-707
Main Authors: El-Zein, A, Brunger, M.J, Newell, W.R
Format: Article
Language:English
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Summary:Absolute differential cross-sections for electron impact excitation of the bending (010) and unresolved stretching (100)+(001) vibrational modes of water (H 2O) are reported. The incident electron energy is E 0=7.5 eV and the scattered electron angular range 10°–120°. Significant angular structure in both the (010) and (100)+(001) differential cross-sections, due to resonant decay from H 2O −, is apparent. This observation confirms the earlier result of Seng and Linder [ J. Phys. B 9 (1976) 2539] for resonance enhancement of the stretching modes, but is contrary to their analysis for the bending mode where they postulated the dominant population mechanism was due to direct scattering. Integral cross-sections for excitation of the (010) and (100)+(001) quanta at 7.5 eV are also reported.
ISSN:0009-2614
1873-4448
DOI:10.1016/S0009-2614(00)00221-9