Abstract
In recent years the HAUP method, which allows determination of simultaneously occurring birefringence and optical activity of crystals, has extensively been applied in order to answer the question of whether there is an optical activity in the incommensurate phase of -type crystals or not. Especially in the case of tetramethylammonium tetrachlorozincate (TMAZC), which was investigated most thoroughly, several authors reported contradictory results. In order to establish possible causes of these discrepancies we performed HAUP measurements on several test samples of quartz and . The results revealed an essential influence of sample preparation and gave us a better insight into the systematical errors, primarily the so-called error, the parasitic ellipticities of polarizer and analyser, and a further parameter representing the ellipticity induced by the sample's surfaces. This made it possible to understand some of the reasons for the diverging results published for -type crystals so far.
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