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Vacuum ultraviolet electron impact excitation of the styrene molecule: cross sections and oscillator strengths

The vacuum ultraviolet electronic excitation of the styrene molecule has been studied in the 0–50 eV energy range, using angle-resolved electron-energy-loss spectroscopy at an incident energy of 1 keV. Intense new features have been observed at 10.3, 11.8, 13.7 and 17.1 eV. They were tentatively assigned to high-energy transitions originating from σ electrons or to double excitations involving π electrons. The absolute generalized oscillator strengths and absolute inelastic differential cross sections have been determined for the band centred at 5.3 eV, associated with the 2,3 1A′←1 1A′ transitions. The absolute elastic differential cross section has also been determined over an angular range of 2.5°–22.0°. The valence photoabsorption spectrum of styrene, derived from the electron-energy-loss spectrum, is compared to a previously measured benzene spectrum in the 3–45 eV energy range.