Collision-induced depolarized scattering by CF4 in a Raman vibrational band

Collision-induced scattering data have been recorded at room temperature for gaseous tetrafluoromethane in a frequency vicinity of the Raman vibrational line v(1) = 908 cm(-1). For the first time, corresponding binary depolarized intensities have been measured in absolute units for frequency shifts up to 110 cm(-1) from the band center. Comparison with theoretical semiclassical intensities computed from dipole-induced dipole and dipole-multipole light scattering mechanisms leads to an evaluation of the first derivative of the dipole-quadrupole polarizability tensor A'. This result is in good agreement with recent ab initio quantum-chemistry calculations of the CF4 multipolar polarizabilities. (C) 1998 American Institute of Physics.