Lecture 4 : Multiple oscillator model for Lattice vibrations
3. Biaxial e.g., orthorhombic crystals where :
4. Biaxial e.g., triclinic and monoclinic crystals where
the principal axes of the real and imaginary parts are different :
As an example, Spitzer and Kleinman listed (also given in the book of Bohren
and Huffman) the relevant parameters with seven oscillators for infra-red
spectra of quartz, where the sets of parameters are different for electric
field along c-axis
than for those for electric field perpendicular to c-axis.
