Reflected broadband (multichannel) coherent anti-Stokes Raman scattering was used to measure the ring-breathing-mode vibrational frequencies of neat liquid benzene, neat liquid deuterated benzene (benzene-$d_6$), and mixtures of these under shock compression to pressures up to 1.53 GPa. The pressure-induced frequency shifts determined for neat benzene agree with those obtained previously by use of backward stimulated Raman scattering. Evidence for nearest-neighbor effects on the vibrational frequency shifts is presented.

• Received 29 March 1983

DOI:https://doi.org/10.1103/PhysRevLett.50.1819