Retrieving "Cotton Effect" from the archives

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1. Optical Activity

   Linked via "Cotton Effect"

   A related, but distinct, phenomenon is Circular Dichroism (CD). While optical activity measures the difference in refractive indices ($\Delta n = nL - nR$), CD measures the differential absorption of left- and right-circularly polarized light ($\Delta A = AL - AR$).
   The Cotton Effect links these two properties. When an absorption band overlaps with a region where optical rotation is changing rapidly (the ORD curve, a characteristic sigmoidal shape appears in the ORD spectrum, accompanied by a corresponding …