| Zusammenfassung: |
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. |
, T. E. M. Staab