THE DIPOLAR COUPLING AND THE SYMMETRY OF PHONONS IN MOLECULAR CRYSTALS

In this article, the symmetry of phonons and the coupling between phonons along different coordinates directions are discussed for molecular crystals in which dipolar coupling exists. Also obtained are the relationships between the Raman tensor components of phonons with k=0 which are of the symmetry of the irreducible representations of the unit cell group and those of groups of atoms which possess some site group in a unit cell.