Range of slow positrons in metal overlayers on Al
作者:
Bent Nielsen,
K. G. Lynn,
T. C. Leung,
G. J. Van der Kolk,
L. J. Van Ijzendoorn,
期刊:
Applied Physics Letters
(AIP Available online 1990)
卷期:
Volume 56,
issue 8
页码: 728-730
ISSN:0003-6951
年代: 1990
DOI:10.1063/1.102694
出版商: AIP
数据来源: AIP
摘要:
Polycrystalline Pd and amorphous PdTa films on Al substrates were studied by a variable energy positron beam and by Rutherford backscattering. Since positron diffusion in the overlayers is limited, the range follows directly from the Doppler broadening as a function of incident positron energy. To observe possible effects of positron backscattering, a sandwich of Al/Pd/Al was studied as well. It was found that the mean penetration depth is not described well byz¯(E)=A(&mgr;g/cm2)×En(E), ifAandnare assumed to be material and energy independent.
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