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Many‐Particle Approach to the Optical Absorption of the Alkali Metals
Author(s) -
Stolz H.
Publication year - 1970
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.19700410106
Subject(s) - alkali metal , absorption (acoustics) , matrix (chemical analysis) , electron , particle (ecology) , physics , potassium , chemistry , quantum electrodynamics , quantum mechanics , optics , oceanography , organic chemistry , chromatography , geology
The influence of the electron‐electron interaction on the optical absorption of the alkali metals is calculated in the ladder‐approximation for the Bethe‐Salpeter equation and in the nearly‐free‐electron approximation of the single‐particle functions. With a suitable approximation of the interaction matrix element the summation of an infinite number of ladder graphs is achieved. The resulting enhancement of the interband absorption — about 33% for sodium and 35% for potassium — is non‐resonant and there are no anomalous structures below the interband threshold.