Europhys. Lett, 48 (5), pp. 519-525 (1999)
Positron annihilation in molecules: The role of vibrational excitation
F. A. Gianturco and T. Mukherjee
Department of Chemistry, The University of Rome
Città Universitaria, 00185 Roma, Italy
(received 25 May 1999; accepted in final form 5 October 1999)
PACS. 34.50Gb - Electronic excitation and ionization
of molecules; intermediate molecular
states (including lifetimes, state mixing, etc.).
PACS. 34.80Bm - Elastic scattering of electrons by atoms and molecules.
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 at the temperatures of the experiment.
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