Volume 48, Number 5, December 1999
|Page(s)||519 - 525|
|Section||Atomic and molecular physics|
|Published online||01 September 2002|
Positron annihilation in molecules: The role of vibrational excitation
Department of Chemistry, The University of Rome, Città Universitaria, 00185 Roma, Italy
Accepted: 5 October 1999
In this work we discuss the theoretical and computational evaluation of the annihilation efficiency of positron beams when scattered by a molecular gas at room temperature. The present quantum treatment for the molecule explores the effects of the dynamical coupling between the target vibrations and the positron. The results show for the first time that such effects can play a role in enhancing Zeff at the temperatures of the experiment.
PACS: 34.50.Gb – Electronic excitation and ionization of molecules; intermediate molecular states (including lifetimes, state mixing, etc.) / 34.80.Bm – Elastic scattering of electrons by atoms and molecules
© EDP Sciences, 1999
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