High-resolution Photoelectron Spectroscopy of Naphthacene Polycrystal by Means of Helium 21.22 eV Resonance Line

Abstract
The photoelectron spectrum of naphthacene polycrystal was obtained with a high-resolution photoelectron spectrometer using a helium 21.22 eV light source, and the vibrational fine structures were examined. The resolution, 21 meV FWHM for the argon P3⁄2 peak, became much better than that obtained by means of a retardingpotential-type electron analyzer. Broad peaks with no distinct intramolecular vibrational structure were observed, and the origin of the peak width was discussed.