The simultaneous measurement of optical activity and circular dichroism in birefringent linearly dichroic crystal sections. I. Introduction and description of the method

The 'HAUP' method, described by Kobayashi and Uesu (1983-85), for the measurement of optical activity in birefringent crystals is extended to include dichroic effects and analysed qualitatively in a novel way using intensity contour maps. The elimination of the parasitic ellipticities of the polariser and analyser is achieved by repeating the measurement in a second crystal setting, rather than physically exchanging the prisms, which has been reported as unworkable.