All Raman spectra are obtained by performing 20 ps ab initio molecular dynamics (AIMD) simulations in the canonical ensemble to achieve equilibrium at 300 K, followed by 80 ps AIMD simulations in the micro-canonical ensemble to remove thermostat effects and sample the polarizabilities. A time step of 1 fs is used in these simulations and polarizabilities are sampled every 5 fs. The AIMD simulations are also performed using the CP2K software with the same simulation setup as mentioned earlier. Power spectra have been calculated