Increased Elemental Specificity of Positron Annihilation Spectra

Journal Article · Sun Sep 01 04:00:00 EDT 1996 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.77.2097· OSTI ID:383289

Asoka-Kumar, P; Alatalo, M; Ghosh, V J; Kruseman, A C; Nielsen, B; Lynn, K G ^[1]

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1. Brookhaven National Laboratory, Upton, New York 11973 (United States)

Positron annihilation spectroscopy (PAS) is a sensitive probe for studying the electronic structure of defects in solids. We show that the high-momentum part of the Doppler-broadened annihilation spectra can be used to distinguish different elements. This is achieved by using a new two-detector coincidence system to examine the line shape variations originating from high-momentum core electrons. Because the core electrons retain their atomic character even when atoms form a solid, these results can be directly compared to simple theoretical predictions. The new approach adds increased elemental specificity to the PAS technique, and is useful in studying the elemental variations around a defect site. {copyright} {ital 1996 The American Physical Society.}

• Research Organization: Brookhaven National Laboratory
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 383289
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 10 Vol. 77; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ALUMINIUM
ANNIHILATION
COINCIDENCE METHODS
CORE LEVELS
DEFECTS
DOPPLER BROADENING
ELECTRONIC STRUCTURE
GERMANIUM
LINE SHAPE
POSITRON PROBES
POSITRONS
SILICON
SPECTROSCOPY