Calculation of the Raman frequency and linewidth of vibrons using anharmonic self energy model for the epsilon , delta(loc) and delta phases in solid nitrogen

Abstract

Temperature dependences of the Raman frequency shifts and linewidths of vibrons nu(1), nu(2) and nu(22) are calculated from the anharmonic self energy in the epsilon, delta(loc) (localized delta) and delta phases of solid nitrogen (P = 18.5 GPa). This is performed by fitting the expressions from the the anharmonic self energy to the experimental frequency and FWHM data for those vibrons from the literature. Our results show that the anharmonic self energy model can explain adequately the observed behavior of the Raman frequency and linewidth of the vibrons for the transitions of the epsilon-delta(loc) - delta in solid nitrogen. This method of analysis can also be applied to other some molecular solids close to the phase transitions.