Symmetry analysis of vibrational spectra

This chapter provides a symmetry analysis of vibrational spectra. It explains how the analysis of vibrational spectra corresponds to the relationship between the symmetry of the molecule, its normal modes, and the selection rules that govern the transitions. Each normal mode can be classified as belonging to one of the symmetry species of the irreducible representations of the molecular point group. Moreover, a normal mode is infrared active if its symmetry species is the same as the symmetry species of x, y, or z. On the other hand, A normal mode is Raman active if its symmetry species is the same as the symmetry species of a quadratic form.