### Abstract

The time-dependent many-electron problem encountered in the theory of energetic ion-atom collisions can be approached systematically within an effective single-particle picture, based, e.g., on the time-dependent density functional theory. In the present contribution we investigate ionization and electron loss from the target for the collision systems p, p̄, He^{2+} + Ne, and p + Ar in the energy range 10 keV/amu-1 MeV/amu. The results presented are based on a static approximation to the exchange-correlation contribution of the effective potential. The corresponding time-dependent single-particle equations are solved with the continuum distorted-wave with eikonal initial-state approximation and the basis generator method, a coupled-channel approach in terms of structurally adapted basis functions. We demonstrate that in either case the results depend strongly on the explicit form of the local static exchange potential. An orbital-dependent analysis of electron removal in He^{2+} + Ne collisions shows that the quality of the exchange potential is decisive for the suppression of artificial reaction channels.

Original language | English |
---|---|

Pages (from-to) | 2063-2076 |

Number of pages | 14 |

Journal | Physical Review A |

Volume | 58 |

Issue number | 3 |

Publication status | Published - Sep 1998 |

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### ASJC Scopus subject areas

- Physics and Astronomy(all)
- Atomic and Molecular Physics, and Optics

### Cite this

*Physical Review A*,

*58*(3), 2063-2076.

**Influence of electronic exchange on single and multiple processes in collisions between bare ions and noble-gas atoms.** / Kirchner, T.; Gulyás, L.; Lüdde, H. J.; Engel, E.; Dreizler, R. M.

Research output: Contribution to journal › Article

*Physical Review A*, vol. 58, no. 3, pp. 2063-2076.

}

TY - JOUR

T1 - Influence of electronic exchange on single and multiple processes in collisions between bare ions and noble-gas atoms

AU - Kirchner, T.

AU - Gulyás, L.

AU - Lüdde, H. J.

AU - Engel, E.

AU - Dreizler, R. M.

PY - 1998/9

Y1 - 1998/9

N2 - The time-dependent many-electron problem encountered in the theory of energetic ion-atom collisions can be approached systematically within an effective single-particle picture, based, e.g., on the time-dependent density functional theory. In the present contribution we investigate ionization and electron loss from the target for the collision systems p, p̄, He2+ + Ne, and p + Ar in the energy range 10 keV/amu-1 MeV/amu. The results presented are based on a static approximation to the exchange-correlation contribution of the effective potential. The corresponding time-dependent single-particle equations are solved with the continuum distorted-wave with eikonal initial-state approximation and the basis generator method, a coupled-channel approach in terms of structurally adapted basis functions. We demonstrate that in either case the results depend strongly on the explicit form of the local static exchange potential. An orbital-dependent analysis of electron removal in He2+ + Ne collisions shows that the quality of the exchange potential is decisive for the suppression of artificial reaction channels.

AB - The time-dependent many-electron problem encountered in the theory of energetic ion-atom collisions can be approached systematically within an effective single-particle picture, based, e.g., on the time-dependent density functional theory. In the present contribution we investigate ionization and electron loss from the target for the collision systems p, p̄, He2+ + Ne, and p + Ar in the energy range 10 keV/amu-1 MeV/amu. The results presented are based on a static approximation to the exchange-correlation contribution of the effective potential. The corresponding time-dependent single-particle equations are solved with the continuum distorted-wave with eikonal initial-state approximation and the basis generator method, a coupled-channel approach in terms of structurally adapted basis functions. We demonstrate that in either case the results depend strongly on the explicit form of the local static exchange potential. An orbital-dependent analysis of electron removal in He2+ + Ne collisions shows that the quality of the exchange potential is decisive for the suppression of artificial reaction channels.

UR - http://www.scopus.com/inward/record.url?scp=0001389488&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0001389488&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0001389488

VL - 58

SP - 2063

EP - 2076

JO - Physical Review A

JF - Physical Review A

SN - 2469-9926

IS - 3

ER -