Features of local structure changes in amorphous selenium films after thermal annealing

Raman spectra of thermal evaporation amorphous selenium annealed in various fixed temperatures above and below the glass transition temperature T$_g$ were studied. Presented that in Raman spectra of films annealed below T$_g$ along with vibrational modes 237 and 250 cm$^{-1}$ appears high-intensity mode 232 cm$^{-1}$ which is not attributable to vibration of bonds in hexagonal selenium. Mode 143 cm$^{-1}$. appears in films annealed above T$_g$ which is attributable to hexagonal selenium but intensity of mode 237 cm$^{-1}$ increases. This features explained by changes in local structures because of variation in concentration ratio between low-temperature and high-temperature modifications of polimorfoids that takes place during annealing.