Calculation of the Raman frequencies as a function of pressure in the solid phases II and III (III’) of benzene

Abstract

We calculate here the Raman frequencies of the lattice modes A(Ag), B(B₂g) and C(B₁gB₃g) as a function of pressure at room temperature for the solid phases (II, III and III') of benzene. This calculation is performed using volume data through the mode Grüneisen parameter. It is found that our calculated frequencies of those lattice modes increase with increasing pressure, as expected. Calculated frequencies are in good agreement with the measurements of the three lattice modes for the solid phases studied in benzene.

Pressure dependence of the Raman frequencies for the modes I, II and III at constant temperatures in phase II of benzene

“…In our recent study [36], we have calculated the pressure dependence of the isothermal compressibility for the solid phase II of benzene using the observed infrared frequencies [5]. Also, very recently, we have calculated the Raman frequencies of various lattice modes as a function of temperature [37] and pressure [38] in phase I, and in solid phases of II and III(III 0 ) of benzene [39]. Near the melting point, we have calculated the Raman frequencies of various modes as a function of pressure at constant temperatures [40].…”

Calculation of the thermodynamic functions using a mean field model for the fluid-solid transition in nitrogen

“…6 It has been pointed out by the Raman spectroscopy that the highpressure phases have closely related structures. 7 Regarding the Raman studies, in our earlier studies, [8][9][10][11][12] we have calculated the Raman frequencies of different modes in various phases of nitrogen.…”