Dielectric Tensor Components of Phenanthrene (C14H10) and Chrysene (C18H12) Derived from Electron Energy Loss Experiments

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Abstract
Electron energy loss spectra in the range from 0 to 40 eV are taken with 60 keV electrons on phenanthrene and chrysene single crystals. Different structure of the loss functions depending on the direction of the transferred momentum is taken into account. The orientation of the x and z axis of the dielectric tensor (not determined by crystal symmetry) is evaluated experimentally and discussed in relation to dipole transition moments. By means of a Kramers‐Kronig transformation the main axis elements of the dielectric tensor are computed from the energy loss functions. The results obtained are interpreted in comparison with the energy and polarization of excited molecular states.