dc.creator Beer, Michael en_US dc.date.accessioned 2006-06-15T12:47:31Z dc.date.available 2006-06-15T12:47:31Z dc.date.issued 1956 en_US dc.identifier 1956-H-5 en_US dc.identifier.uri http://hdl.handle.net/1811/7499 dc.description $^{1}$ R. Newman and Halford, J. Chem. Phys. 18, 1276 (1950) $^{2}$ I. Sandeman, Proc. Roy. Soc. A.232, 105 (1955)"" en_US dc.description Author Institution: The Harrison M. Randall Laboratory of Physics, University of Michigan en_US dc.description.abstract In anisotropic crystals of orthorombic or higher symmetry the dichroic ratios can be correlated with the inclinations of the transition moment vectors if the radiation is incident normally on principal planes and it is plane polarised so that the electric vector is parallel to the principal axes.1 In crystals of lower symmetry this condition cannot be met. The case of tri-clinic crystals is discussed. It is shown by electromagnetic theory and the theory of anomolous dispersion that in those $cases^{1}$. Strong absorption bands can give rise to very high dichroic $ratios. ^{2}$. Strong absorption bands will in general show a spurious splitting with different polarization characteristics for the components of the doublet. These can be used to obtain an expression for the orientation of the transition moment $vector. ^{3}$. Weak bands as overtone and combination bands will in general show small dichroic ratios. The theory is illustrated with reference to the spectra of $NN^{1}$ diacethylhexamethylenediamine.2 en_US dc.format.extent 105380 bytes dc.format.mimetype image/jpeg dc.language.iso en en_US dc.publisher Ohio State University en_US dc.title THE SPECTROSCOPY OF CRYSTALS OF LOW SYMMETRY en_US dc.type article en_US
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