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Phys. Rev. A 61, 052717 (2000) [9 pages]

Electronic capture by He2+ from atomic and molecular hydrogen

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M. M. Sant’Anna*, W. S. Melo, A. C. F. Santos, V. L. B. de Jesus†, M. B. Shah‡, G. M. Sigaud, and E. C. Montenegro
Departamento de Física, Pontifícia Universidade Católica do Rio de Janeiro, Caixa Postal 38071, Rio de Janeiro 22452-970, Brazil

H. F. Busnengo, S. E. Corchs, and R. D. Rivarola
Instituto de Física Rosario (CONICET-UNR), Avenida Pellegrini 250, 2000 Rosario, Argentina

L. Gulyás
Institute of Nuclear Research of the Hungarian Academy of Sciences (ATOMKI), P.O. Box 51, H-4001 Debrecen, Hungary

Received 2 December 1999; published 18 April 2000

We present absolute measurements of electron-capture cross sections in atomic and molecular hydrogen by α particles with energies ranging from 0.5 to 2.75 MeV. The measured single-electron-capture cross sections as well as the ratio σcH2/σcH are compared with several available theories. In particular, a detailed analysis of the role played by two-electron processes in the single-electron capture of H2 is performed considering a distorted-wave model as a starting point.

© 2000 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevA.61.052717
DOI:
10.1103/PhysRevA.61.052717
PACS:
34.70.+e, 34.50.-s, 82.30.Fi

*Present address: Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 977420.

†Present address: Centro Brasileiro de Pesquisas Físicas, Rua Dr. Xavier Sigaud 150, Rio de Janeiro 22290-180, RJ, Brazil.

‡Permanent address: Department of Pure and Applied Physics, The Queen’s University of Belfast, Belfast BT7 1NN, Northern Ireland, UK.

 
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