Abstract
AbstractA systematic study of vibronic excitation in benzene via forward electron scattering was carried out using a novel type of a trochoidal electron spectrometer. Energyâloss spectra in the energy range 1.0â9.5 eV, with residual energies 0.03â20 eV as well as excitation functions for individual vibrational levels of some of the triplet and singlet states are presented and discussed. Following observations were made. (1) A new sâtype Rydberg series with quantum defect δ = 0.86. (2) Additional information on the complex 6â6.5 eV band. (3) A new core excited shape resonance at 6.5 eV. (4) A narrow Feshbach resonance at 5.87 eV, The new spectrometer is suggested as a tool for routine study of forbidden transitions and negative ion states in organic molecules.
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