Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2004-02-18
Physics
Condensed Matter
Soft Condensed Matter
8 pages, 7 figures
Scientific paper
Mijnarends et al. [J. Phys. Condens. Matter {\bf 10}, 10383 (1998)] contested the best existing calculations of positron annihilation rates in jellium and crystal lattices, pointing in this way at deficiencies of existing theories of electron-positron interaction in these materials. In the present work the local enhancement factors due to positron-electron interaction in Li, Be, B, C, N and O are computed in a consequent many-body approach for core and as concerns lithium also for conduction electrons and compared to the results of existing approximations to this problem which avoid direct many-body calculations in metals, i.e. the local density, generalized gradient and weighted density approximations, as well as to experimental data. Conclusions about positron lifetime and positron-electron correlation energy are also presented. Suggestions concerning annihilation rates in an electron gas agree with those of Mijnarends et al.
Boronski E.
Stachowiak H.
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