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Vibrational Excitation and Dissociative Attachment

  • J. M. Wadehra
Part of the Topics in Current Physics book series (TCPHY, volume 39)

Abstract

The process of dissociative electron attachment to molecules is known to be one of the main sources of production of negative ions in gaseous discharges, plasma switches, and gas lasers. In this process, a diatomic (or polyatomic) molecule, under the impact of an electron, dissociates into its component atoms (or smaller molecular species) while the incident electron attaches itself to one of the component products. The rate of negative ion production via dissociative attachment can be significantly increased, for both homonuclear molecules (for example, H2) and heteronuclear molecules (for example, HCl), if the molecule initially has stored internal energy in the form of rovibrational excitation. Schematically, for electron impact on a molecule AB,
$$e\, + \,AB \to A + {B^ - }\quad \left( {dissociative\,electron\,attachment} \right)$$
$$e\, + AB\left( {{v_i}} \right) \to e + AB\left( {{v_f}} \right)\quad \left( {vibrational\,excitation\,by\,electron\,impact} \right)$$

Keywords

Vibrational Level Resonant State Potential Curve Excitation Cross Section Electron Attachment 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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© Springer-Verlag Berlin Heidelberg 1986

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  • J. M. Wadehra

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