Photoemission from Molecular Crystals, Bandstructure and Resonance Effects

Abstract

Two decades ago the only we11-investigated electronic states of organic solids were those close to the top of the valence bands and at the bottom of the conduction band. Since then photoelectron spectroscopy in its various modes has been established as a very powerful tool for probing the electronic structure of atoms, molecules, solids and surfaces over large binding energy ranges. Different aspects of photoemission spectroscopy have been treated in a series of review articles [1,2]. In particular this spectroscopy has contributed significantly to our progress in understanding the electronic structure of molecular crystals and organic solids as recent review papers document (e.g. Ref. 3–6). Using conventional x-ray and VUV sources (e.g. A1 Kα or He lines) a wealth of interesting information has been obtained concerning, for example, binding energies and widths of valence bands and core levels, ligand field splittings, chemical shifts and intermolecular relaxation phenomena in the solid state.KeywordsValence BandMolecular CrystalValence Band SpectrumEnergy Distribution CurveBinding Energy RangeThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.