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The dichroism of ultra-violet absorption bands of thin single crystals of some organic compounds has been measured, and the results used to determine the direction of the molecular transition moments of the peptide group and of substituted phenyl groups. Some of the theory of the optics of absorbing crystals has been presented in a form which is useful in interpreting dichroism measurements in terms of crystal and molecular structure.
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John Ward (1955) studied this question.
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