Taira Gazi gizi Kerimova
Doctor of Physical and Mathematical Sciences, Professor

15

1. Investigations of energy spectra of the A²B₂³C₄⁶ type mixed diamond like chalkogenides and the layered-chained compounds of   A³B⁶, A³B³C₂⁶ type.

2. Molecular spectroscopy of the free-radical status of the organic molecules.

As the result of the investigation (experimental, theoretical-group, theoretical calculations) the features of formation of the electron and vibration spectra of compounds A²B₂³C₄⁶ (ph.gr.S₄²) have been established. The characters of optical transition in the high symmetrical points of the Brillouin zone have been established, the parameters of the valence band-spin-orbital and lattice scattering the deformation potentials of band extrema have been determined. The influence of hydrostatic pressure on the phonon spectra of some A²B₂³C₄⁶ compounds have been investigation. In the Harrison-Kitting model Grunaizen parameter and bulk modules have been determined to describe the optical phonons under the influence of pressure. The analyses of solution of the dynamical matrix shoved, that the low frequency phonons are connected with the vibrations, in which the angle between the bonds changes, but high frequency phonons are connected with the changes of length of the bonds under the pressure.

The nonequlibrium processes (photoconductivity, photoluminescence, thermo stimulated conductivity) of the mentioned compounds have been investigated. Spectra of the local states, the mechanism of the generation-recombination processes determined.

The features of the phonon spectra and their change under pressure, anisotropy of terminal expansion and thermo conductivity in the range of 5-300 K of compounds of A³B⁶ (GaS, GaSe, İnSe, TlSe), the nature of negative thermal expansion, also in graphite and nitride bor, the mechanism of the carry of carries and localization effects in the electron spectra, the influence of Υ-radiation and strong magnetic field (to 8 Tl) on transport of carries in İnSe and TlSe.

The regularities of the electron-vibration structure of the mono-, di- and threemethilbenzole hydrocarbons in paraffin matrix in the low temperature range have been established.