Abstract
Vibrational frequencies of the impurity atoms in GaSe crystal were calculated for the first time in the approximation of isolated impurity atoms. The calculations were performed using Green's function method. It is shown that, except the local vibrations, which form when subsituting Se and Ga atoms in GaSe by easier impurity atoms, the appearance of gap modes are also possible. The results of calculations are compared with the existing data of the IR and Raman scattering experiments.
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