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Title: Chemical sensitivity in positron annihilation with just one single Ge detector
Author(s): M. Haaks Person, T. E. M. Staab Person, K. Saarinen and K. Maier Person
Journal: Phys. Status Solidi A
Year: 2005
Volume: 202
Issue: 4
Pages: R38--R40
DOI: 10.1002/pssa.200510004
File URL: http://onlinelibrary.wiley.com/doi/10.1002/pssa.200510004/abstract
Abstract: We present a novel method for analyzing the data from momentum distribution measurements employing positron annihilation, using just one single Ge-detector, but employing a mathematically sufficiently well suited model for background subtraction. For a variety of high purity metals the resulting momentum distributions have exactly the same shapes up to 35 x 10(-3) m(0)c, as those obtained with coincidence Doppler broadening of the annihilation radiation using a two-detector system. This data analysis applies to any positron source without high energy gammas or a slow positron beam system with just a single Ge-detector and enables the possibility of analysing the chemical surrounding at the positron trapping site without any additional hardware. In particular, in combination with a slow positron microbeam, it allows a spatially resolved measurement of the electron's momentum distribution. (c) 2005 WILEY-VCH Verlag GmbH W Co.

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