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An Analysis of Modulation Experiments for Raman Optical Activity

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The dependence of Raman optical activity and the associated artifacts on the scattering angle is discussed in terms of the Stokes-Mueller calculus for the modulation between right and left circular polarization states in the incident laser radiation, in the Raman scattered light, and in both simultaneously. The incident beam modulation technique implemented in backward scattering is identified as the ultimate experimental strategy for measurements on chiral molecules randomly oriented in an optically isotropic phase. Both the incident and the scattered beam modulation techniques have been found to isolate the pure magnetic dipole contribution to the circular intensity differences in right-angle scattering for orientations of the analyzer in the scattered beam and of the azimuth of the linearly polarized incident radiation, respectively, at ~ ±35.26° from the vertical.

Keywords: Modulation spectroscopy; Optical activity; Optical artifacts; Raman optical activity; Raman spectroscopy; Stokes-Mueller calculus; Vibrational optical activity

Document Type: Research Article


Affiliations: 1: Chemistry Department, The University, Glasgow G12 8QQ, U.K.; present address: Syracuse University, Department of Chemistry, Center for Science and Technology, Syracuse, NY 13244 2: Chemistry Department, The University, Glasgow G12 8QQ, U.K.

Publication date: March 1, 1990

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