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The IR- and Raman-active phonon frequencies, as well as the elastic constantsof orthorhombic GeSe, were calculatedas a function of hydrostatic pressureusing the method of density functional in the ABINIT software package.Comparison with the published results of theoretical calculations andexperimental data of the pressure dependence of Raman-active phonons has beencarried out. Our calculations show that at a pressure of about 29 GPa thecrystal structure of GeSe undergoes a continuous transition from simpleorthorhombic to base-centered orthorhombic lattice.

The pressure dependence of the phonon spectra and elastic modulus of orthorhombic : the method of local density functional