Abstract
A comparative study of the collective polarizability anisotropy dynamics of benzene, 1,3,5-trifluorobenzene, and hexafluorobenzene was carried out by using optical heterodyne-detected Raman-induced Kerr effect spectroscopy (OHD-RIKES) with 45 fs laser pulses. The OHD-RIKES data were analyzed by using a model-dependent approach and a Fourier transform approach, which yields a spectral density for the liquid. From an analysis of the long-time tails, collective reorientation times of 2.45 ± 0.06, 9.05 ± 0.10, and 13.5 ± 0.1 ps were obtained respectively for C6H6, 1,3,5-C6F3H3, and C6F6. The spectral densities are narrower for 1,3,5-C6F3H3 and C6F6 than for C6H6 by roughly a factor of 2. Information about the intermolecular vibrational modes of the liquid is contained in the reduced spectral density which is obtained by subtracting the tail-matched diffusive reorientational response from the OHD-RIKES data. In the case of C6H6 and C6F6, the intermolecular spectral density can be decomposed into at least two b...
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