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Generalized oscillator strength for the transition of anthracene, as determined by electron energy-loss spectroscopy

As part of a systematic quantitative study of the angular dependence of valence-shell electron-impact excitation of molecules, we have determined, for the first time, the absolute inelastic differential cross section and the generalized oscillator strength (GOS) for the transition (5.2 eV) in anthracene . A minimum in the GOS has been observed at a value of around 0.2 au. The GOS values were determined from the relative inelastic differential cross section, measured with an electron-impact spectrometer, which uses a Wien-filter velocity analyser. The incident electron energy was 1 keV, the energy resolution was 1.0 eV and the energy-loss spectra were obtained in the range of - . The absolute elastic differential cross section was determined in the - angular range.