Abstract
AbstractThe anharmonic contributions to the second‐order Doppler shift are estimated theoretically for a simple lattice model containing impurities and vacancies at the lattice points by considering the double‐time Green's function technique in the high temperature limit. The cubic anharmonic terms in the expansion of the potential energy function of the proposed model are found to produce a significant change in the time dependence of the correlation functions and result in the appearance of additional terms proportional to the temperature in the expression for the energy shift. The estimated result thus shows that the effects of anharmonicity on the second‐order Doppler shift become important at high temperatures and it becomes possible to estimate the changes in the third‐order force constants of the defect lattice.
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