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Measurement of the Circular Polarization of the Luminescence of Photoselected Samples Under Artifact-Free Conditions

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The measurement of the Circular Polarization of the Luminescence (CPL) in viscous solvents is hampered by the occurrence of artifacts. These arise when the emitted radiation is partially linearly polarized due to the photoselection effect. It is shown that there are two configurations of the CPL spectrometer in which such linear polarization artifacts are virtually negligible: one requires perpendicular excitation and emission channels as well as horizontally polarized incident radiation; the other involves a 180° geometry and unpolarized excitation light. In both options, essentially artifact-free CPL data are obtained, enabling the study of the directional dependence of the optical activity in emission. This is illustrated for the case of the 3ππ* → S 0 phosphorescence of the cross-conjugated dienone α-santonin.

Keywords: Circular polarization of luminescence; Luminescence; Optical activity

Document Type: Research Article


Affiliations: Department of Chemistry, Gorlaeus Laboratories, Leiden University, P.O. Box 9502, NL - 2300 RA Leiden, The Netherlands

Publication date: February 1, 1990

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