Infrared Dichroism of Lattice Vibrations of the Bu Species in a Monoclinic Crystal

Abstract

Following Hadni et al. ⁽¹⁾ with the starting point in a theory of the transition moment of a B_u lattice vibration a correct use has been made of symmetry requirements imposed on tensors relating the vectors of molecular displacements with the electric field strength. This leads to a new formula for the orientation of the transition moment in a monoclinic crystal. An expression is also derived for the dichroic ratio of such bands which can be verified experimentally.