Infrared spectroscopic study of molecular hydrogen bonding in chiral smetic liquid crystals

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• Eq. 1 is exact only in absence of birefringence (optical anisotropy in the real part of the dielectric constant), when the eigenmodes of a dichroic medium are linearly polarized along the directions of maximum and minimum absorbance. For the vibrations studied here, polarized nearly along the optic axis of the real part of the dielectric constant, the birefringence can be ignored in few micron thick samples.
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