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Calculation of Vibrational State Density and Long‐Wavelength Spectral Density of Compositionally Disordered Chains
Author(s) -
Böttger H.,
Kleinert P.
Publication year - 1981
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.2221030124
Subject(s) - impurity , wavelength , raman spectroscopy , reflection (computer programming) , molecular physics , cluster (spacecraft) , density of states , state (computer science) , spectral line , atomic physics , materials science , chemistry , condensed matter physics , physics , optics , quantum mechanics , organic chemistry , algorithm , computer science , programming language
The problem of a possible disorder induced reflection of the vibrational state density in infrared and Raman spectra is studied for simple mass disordered chains. The state density and the long‐wavelength spectral density are calculated exactly for the case of infinite mass impurity atoms and approximately by an embedded cluster method, which is applicable to systems with arbitrary impurity mass. A remarkable resemblance between state density and spectral function can occur.