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Forward Electron Scattering in Benzene; Forbidden Transitions and Excitation Functions
Author(s) -
Allan Michael
Publication year - 1982
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19820650708
Subject(s) - chemistry , rydberg formula , quantum defect , atomic physics , excited state , excitation , resonance (particle physics) , singlet state , electron ionization , scattering , shape resonance , electron , spectrometer , electron spectrometer , electron scattering , ion , ionization , physics , cathode ray , organic chemistry , quantum mechanics , optics
A systematic study of vibronic excitation in benzene via forward electron scattering was carried out using a novel type of a trochoidal electron spectrometer. Energy‐loss spectra in the energy range 1.0–9.5 eV, with residual energies 0.03–20 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 s‐type Rydberg series with quantum defect δ = 0.86. (2) Additional information on the complex 6–6.5 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.