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

H. Schmidt-Böcking; V. Mergel; R. Dörner; C. L. Cocke; O. Jagutzki; L. Schmidt; Th. Weber; H. J. Lüdde; E. Weigold; J. Berakdar; H. Cederquist; H. T. Schmidt; R. Schuch; A. S. Kheifets

doi:10.1209/epl/i2003-00378-5

All issues

Volume 62 / No 4 (May 2003)

Europhys. Lett., 62 4 (2003) 477-483

Abstract

Issue		Europhys. Lett. Volume 62, Number 4, May 2003


Page(s)		477 - 483
Section		Atomic and molecular physics
DOI		https://doi.org/10.1209/epl/i2003-00378-5
Published online		01 May 2003

Europhys. Lett., 62 (4), pp. 477-483 (2003)

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

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

Corresponding author: schmidtb@ikf.uni-frankfurt.de

Received: 4 October 2002
Accepted: 20 March 2003

Abstract

The correlated Tunneling Transfer Ionization (TuTI) channel in fast 4-body processes $\ab{p} +\chem{He}\rightarrow\chem{H^0}+\chem{He^{2+}}+\ab{e}$ is utilized to probe the highly correlated asymptotic parts of the $\chem{He}$ ground-state momentum space wave function. In this reaction, predominantly at large nuclear impact parameters, one electron in the $\chem{He}$ 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 $\chem{He}$ 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

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