Determination of the Dielectric Tensor of Pyrene (C16H10) by Means of Electron Energy Loss Measurements

✍ Scribed by H. Venghaus

• Publisher: John Wiley and Sons
• Year: 1972
• Tongue: English
• Weight: 499 KB
• Volume: 54
• Category: Article
• ISSN: 0370-1972
• DOI: 10.1002/pssb.2220540231

✦ Synopsis

Abstract

Electron energy loss spectra from 0 to 40 eV were taken on pyrene single crystals with 60 keV electrons. The energy loss functions Im (−1/ε~ii~) (i = x, y, z) were derived from spectra recorded with different orientation of the momentum transferred to the crystal by the electrons scattered inelastically. By means of a Kramers‐Kronig transformation the main axis elements ε~ii~ of the dielectric tensor were calculated from Im (−1/ε~ii~). The results obtained are interpreted in terms of excited molecular states in relation to the results of optical absorption measurements, theoretical work and other electron energy loss experiments.