Range of slow positrons in metal overlayers on Al

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 o...

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Bibliographic Details
Published in:Applied physics letters 1990-02, Vol.56 (8), p.728-730
Main Authors: Nielsen, Bent, Lynn, K. G., Leung, T. C., Van der Kolk, G. J., Van Ijzendoorn, L. J.
Format: Article
Language:English
Subjects:
360104 - Metals & Alloys- Physical Properties
656003 - Condensed Matter Physics- Interactions between Beams & Condensed Matter- (1987-)
ALLOYS
ALUMINIUM
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
BACKSCATTERING
CHARGED-PARTICLE TRANSPORT
COLLISIONS
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
DATA
ELEMENTARY PARTICLES
ELEMENTS
EXPERIMENTAL DATA
FERMIONS
INFORMATION
INTERFACES
LEPTONS
MATERIALS SCIENCE
METALS
NUMERICAL DATA
PALLADIUM
PALLADIUM ALLOYS
PENETRATION DEPTH
PLATINUM METAL ALLOYS
PLATINUM METALS
POSITRON COLLISIONS
POSITRONS
RADIATION TRANSPORT
SCATTERING
TANTALUM ALLOYS
THIN FILMS
TRANSITION ELEMENTS
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Description
Summary: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 by z̄(E)=A(μg/cm2)×En(E), if A and n are assumed to be material and energy independent.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.102694