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Issue Europhys. Lett.
Volume 62, Number 4, May 2003
Page(s) 477 - 483
Section Atomic and molecular physics
DOI 10.1209/epl/i2003-00378-5

DOI: 10.1209/epl/i2003-00378-5
Europhys. Lett., 62 (4) , pp. 477-483 (2003)

Revealing the non- s2 contributions in the momentum wave function of ground-state $\chem$

H. Schmidt-Böcking1, V. Mergel1, R. Dörner1, C. L. Cocke2, O. Jagutzki1, L. Schmidt1, Th. Weber1, H. J. Lüdde3, E. Weigold4, J. Berakdar5, H. Cederquist6, H. T. Schmidt6, R. Schuch6 and A. S. Kheifets4

1  Institut für Kernphysik, Universität Frankfurt August-Euler-Str. 6, 60486 Frankfurt, Germany
2  Department of Physics, Kansas State University - Manhattan, KA 66506, USA
3  Institut für Theoretische Physik, Universität Frankfurt Robert-Mayer-Str. 6, 60487 Frankfurt, Germany
4  RSPhysSE, Australian National University - Canberra 0200, Australia
5  Max-Planck Institut für Mikrostruktur Physik - Weinberg 2, 06120 Halle, Germany
6  Department of Physics, Stockholm University - S-10405 Stockholm, Sweden

schmidtb@ikf.uni-frankfurt.de

(Received 4 October 2002; accepted in final form 20 March 2003)

Abstract
The correlated Tunneling Transfer Ionization (TuTI) channel in fast 4-body processes $\ab{p} +\chem\rightarrow\chem+\chem{He^}+\ab{e}$ is utilized to probe the highly correlated asymptotic parts of the $\chem$ ground-state momentum space wave function. In this reaction, predominantly at large nuclear impact parameters, one electron in the $\chem$ ground state is captured by the proton by tunneling through the two-center barrier when electron and proton velocity vectors resonantly match. The measured 3-particle final-state momentum distributions show characteristic features that we trace back to the highly correlated non- s2 components of the $\chem$ ground-state momentum wave function. This conclusion is supported by a simple heuristic model.

PACS
34.70.+e - Charge transfer.
34.50.Fa - Electronic excitation and ionization of atoms (including beam-foil excitation and ionization).
39.90.+d - Other instrumentation and techniques for atomic and molecular physics.

© EDP Sciences 2003


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