Calculation of the raman frequencies at low pressures and temperatures (σ-phase) solid nitrogen

We calculate the Raman frequencies of the E mode and, the low and high frequency T mode as a function of temperature at a constant pressure of 2.85 kbar in the -phase of solid nitrogen. The Raman frequencies of those lattice modes are calculated using the volume data from the literature at various temperatures (2.85 kbar) for the -phase of solid N through the mode Grüneisen parameter. Our predicted Raman frequencies can be compared with the experimental data and by this method the Raman frequencies can be calculated as a function of temperature at some other constant pressures. © 2013 World Scientific Publishing Company.