Contribution of valence s+p type electrons to the high momentum components of the electron-positron momentum density in gold |
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Authors: | Anna Rubaszek |
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Institution: | W.Trzebiatowski Institute of Low Temperatures and Structure Research, Solid State Physics, Polish Academy of Sciences, P.O. Box 1410, 50-950 Wroclaw 2, Poland |
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Abstract: | It is generally believed that the high momentum components (HMCs) of the angular correlation of annihilation radiation or Doppler broadening spectra map the positron annihilation with predominately core electrons, containing only a small fraction coming from localised d+f-type valence electrons. In present work, we study how far the contribution of valence electrons to the HMCs of the electron-positron (e-p) momentum density can be neglected. Calculations are performed for gold within both the independent particles model (IPM) and including the e-p correlation effects non-locally, using the weighted density approximation (WDA). In particular, the HMCs due to valence s+p-type electrons are compared with their core and d+f-type valence counterparts. |
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Keywords: | 78 70 Bj 71 20 &minus b 71 60 +z |
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