Abstract

In a recent paper Kiefer and Topp have shown how the depolarization ratio can be scanned automatically as a function of Raman shift. By means of a rotating split polarization rotator which is positioned in the laser beam and of a gated, two-channel computing photon counting system the quantities <i>I</i>⊥, <i>I</i>∥, and ρ = <i>I</i>⊥/<i>I</i>∥ can be directly and simultaneously recorded. By combining this technique with the method of difference Raman spectroscopy one is also able to subtract the anisotropically scattered light (<i>I</i>⊥, ~ 3γ) from the <i>I</i>∥ spectrum which contains isotropically as well as anisotropically scattered Raman light (<i>I</i>∥ ~ 45α⁻² + 4γ²). Although this technique was already suggested in Ref. 1, the present note shows (to our knowledge) the first example of a real time scan of the purely isotropic part of Raman scattered light (trace scattering).

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