Abstract

An accurate measurement has been made of the Raman scattering cross section of the 992 cm<sup>-1</sup> line of benzene. Previous cross-section measurements were either made indirectly by comparison with the Ray-leigh scattering cross section or by using a pulsed light source. In the present measurement the cross section was measured directly using a cw argon laser as the light source. The results give a peak differential cross section of 1.05(±0.08)×10<sup>-29</sup> cm<sup>2</sup> per molecule, per steradian, per wavenumber of linewidth, per plane of polarization for an incident light beam with a wavelength of 4880 Å, and a linewidth of 2.3 (±0.05) cm<sup>-1</sup>. Allowing for the wavelength dependence and the optical dispersion, our total cross section agrees to within 20% with two other results. The Raman scattering cross sections of other liquids have been measured by use of the 992 cm<sup>-1</sup> line of benzene as a reference. These values, together with details of the absolute cross-section measurement, are presented.

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