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Determination of the Dielectric Tensor of Pyrene (C 16 H 10 ) by Means of Electron Energy Loss Measurements
Author(s) -
Venghaus H.
Publication year - 1972
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220540231
Subject(s) - electron , atomic physics , excited state , electron energy loss spectroscopy , tensor (intrinsic definition) , dielectric , absorption (acoustics) , spectral line , chemistry , dielectric loss , physics , optics , quantum mechanics , mathematics , pure mathematics
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.