Positron binding to alkali-metal hydrides: The role of molecular vibrations

Franco A. Gianturco, Jan Franz, Robert J. Buenker, Heinz-Peter Liebermann, Lukáš Pichl, Jan-Michael Rost, Masanori Tachikawa, and Mineo Kimura
Phys. Rev. A 73, 022705 – Published 6 February 2006

Abstract

The bound vibrational levels for J=0 have been computed for the series of alkali-metal hydride molecules from LiH to RbH, including NaH and KH. For all four molecules the corresponding potential-energy curves have been obtained for each isolated species and for its positron-bound complex (e+XH). It is found that the calculated positron affinity values strongly depend on the molecular vibrational state for which they are obtained and invariably increase as the molecular vibrational energy content increases. The consequences of our findings on the likelihood of possibly detecting such weakly bound species are briefly discussed.

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  • Received 6 October 2005

DOI:https://doi.org/10.1103/PhysRevA.73.022705

©2006 American Physical Society

Authors & Affiliations

Franco A. Gianturco* and Jan Franz

  • Department of Chemistry and INFM, University of Rome La Sapienza, Piazzale A. Moro 5, 00185 Rome, Italy

Robert J. Buenker and Heinz-Peter Liebermann

  • Fachbereich C-Mathematik und Naturwissenschaften, Bergische Universitaet Wuppertal, Gaussstrasse 20, D-42119 Wuppertal, Germany

Lukáš Pichl and Jan-Michael Rost

  • Max Planck Institute for the Physics of Complex Systems, Noethnitzer St. 38, D-01187 Dresden, Germany

Masanori Tachikawa

  • Graduate School of Science, Yokohama-city University, Seto 22-2, Kanazawa-ku, Yokohama 236-0027, Japan

Mineo Kimura

  • Graduate School of Sciences, Kyushu University, Fukuoka 812-8581, Japan

  • *Corresponding author; Fax: +39-06-499913305; Email address: fa.gianturco@caspur.it
  • Present address: Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom.
  • On leave from International Christian University, Osawa 3-10-2, Mitaka, Tokyo 181-8585, Japan.

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Vol. 73, Iss. 2 — February 2006

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