Positronium-atom collisions

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS

卷:221

Article; Proceedings Paper

Walters, HRJ ; Yu, ACH ; Sahoo, S ; Gilmore, S

关键词: positronium;    scattering;    close coupling;    pseudostates;    atomic hydrogen;    helium;    lithium;    alkali metal;    resonances;    positronium negative ion;    hydrogen negative ion;   

DOI  :  10.1016/j.nimb.2004.03.047

来源: Elsevier

【 摘 要 】

New results are presented for Ps(1s) scattering by H(1s), He(1(1)S) and Li(2s). Calculations have been performed in a coupled state framework, usually employing pseudostates, and allowing for excitation of both the Ps and the atom. In the Ps(1s)-H(1s) calculations the H- formation channel has also been included using a highly accurate H- wave function. Resonances resulting from unstable states in which the positron orbits H- have been calculated and analysed. The new Ps(1s)-He(1(1)S) calculations still fail to resolve existing discrepancies between theory and experiment at very low energies. The possible importance of the Ps(-) formation channel in all three collision systems is discussed. (C) 2004 Elsevier B.V. All rights reserved.

【 授权许可】

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