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Optical Properties and One‐Particle Spectral Function in Non‐Ideal Plasmas
Author(s) -
Fortmann C.,
Röpke G.,
Wierling A.
Publication year - 2007
Publication title -
contributions to plasma physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0863-1042
DOI - 10.1002/ctpp.200710040
Subject(s) - bremsstrahlung , physics , plasma , polarization (electrochemistry) , inverse , quantum electrodynamics , computational physics , atomic physics , quantum mechanics , electron , geometry , mathematics , chemistry
A basic concept to calculate physical features of non‐ideal plasmas, such as optical properties, is the spectral function which is linked to the self‐energy. We calculate the spectral function for a non‐relativistic hydrogen plasma in GW ‐approximation. In order to go beyond GW approximation, we include self‐energy and vertex correction to the polarization function in lowest order. Partial compensation is observed. The relation of our approach to GW and GW Γ calculations in other fields, such as the band‐structure calculations in semiconductor physics, is discussed. From the spectral function we derive the absorption coefficient due to inverse bremsstrahlung via the polarization function. As a result, a significant reduction of the absorption as compared to the Bethe‐Heitler formula for bremsstrahlung is obtained. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)