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Energy shift in the resonant absorption of γ‐rays due to disordering of the lattice
Author(s) -
Srivastava B. P.,
Sharma H. N. K.,
Bhattacharya D. L.
Publication year - 1972
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.2220490131
Subject(s) - lattice (music) , atomic physics , vacancy defect , condensed matter physics , force constant , atom (system on chip) , doppler effect , chemistry , molecular physics , physics , quantum mechanics , molecule , acoustics , computer science , embedded system
A theoretical expression for the energy shift of the resonant absorption of γ‐rays by a disordered lattice has been derived using the double‐time Green's function and taking a simplified model of a vacancy and an interstitial pair in the lattice. Considering only nearest‐neighbour interactions in the harmonic approximation it has been found that in addition to the energy shift due to the second‐order Doppler effect there is an additional shift due to the disordering of the lattice which depends on the position coordinate of the interstitial atoms, the changed force constant of this atom, and the temperature.