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The Role of the Cut‐off Energy in Tests of the X‐Ray Threshold Theory
Author(s) -
Dow J. D.,
Smith D. L.
Publication year - 1974
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.2220630226
Subject(s) - atomic physics , absorption (acoustics) , energy (signal processing) , scattering , enhanced data rates for gsm evolution , physics , nuclear physics , materials science , optics , computer science , quantum mechanics , artificial intelligence
It is shown that the cut‐off energy ξ in the Mahan‐Nozière‐de Dominieis (MND) theory of X‐ray absorption thresholds, ϵ 2 (ω) = A 2 [(hω ‐ E T )/ξ] −α , is constrained by existing data to be almost implausible small for Li: ξ < 0.5 eV. If ξ is significantly smaller, ξ < 0.08 eV, then inelastic scattering experiments designed to convert the rounded Li threshold into a peaked edge may not be sucessful and may not test the MND theory.