Normal Vibrations and Intermolecular Forces of Crystalline Benzene and Naphthalene

Abstract

The GF matrix method was applied to the analysis of band splittings and lattice vibrations of crystalline benzene. The far-infrared spectrum of crystalline naphthalene was measured in the region from 300 to 50 cm−1 and three infrared-active lattice vibrations were observed. A normal-coordinate treatment of the lattice vibrations of naphthalene was performed. Intermolecular force constants of nonbonded hydrogen—hydrogen pairs and hydrogen—carbon pairs were obtained.