Primetzhofer D, Rund S, Roth D, Goebl D, Bauer P. Electronic excitations of slow ions in a free electron gas metal: evidence for charge exchange effects.
PHYSICAL REVIEW LETTERS 2011;
107:163201. [PMID:
22107378 DOI:
10.1103/physrevlett.107.163201]
[Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2011] [Indexed: 05/31/2023]
Abstract
Electronic energy loss of light ions transmitted through nanometer films of Al has been studied at very low ion velocities. For hydrogen, the electronic stopping power S is found to be perfectly proportional to velocity, as expected for a free electron gas. For He, the same is anticipated, but S shows a transition between two distinct regimes, in both of which S is velocity proportional-however, with remarkably different slopes. This finding can be explained as a consequence of charge exchange in close encounters between He and Al atoms, which represents an additional energy loss channel.
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