Raman Scattering from Molecular Crystals. I. Powdered Naphthalene

Abstract

The Raman spectrum of powdered naphthalene has been measured at room temperature using 6328‐Å He–Ne laser excitation and a double monochromator with photoelectric detection and digital recording. Eighty‐six lines are observed, among them all the fundamentals assigned by Hanson and Gee [J. Chem. Phys. 51, 5052 (1969)] from Raman, phosphorescence, and fluorescence spectra. Using narrow slits (0.5–1 cm−1) several asymmetric and multiple lines are discovered and resolved into separate components. Five weak, very broad lines are discovered and interpreted as second‐order lines or combinations of intramolecular and lattice vibrations. The width is determined for some of the lines. Intensities are given for all lines.