Electronic excitation (5–9 eV) in ethylene and some haloethylenes by threshold electron-impact spectroscopy with an improved energy resolution
1980; Elsevier BV; Volume: 52; Issue: 3 Linguagem: Inglês
10.1016/0301-0104(80)85245-1
ISSN1873-4421
AutoresG.J. Verhaart, H.H. Brongersma,
Tópico(s)Atomic and Molecular Physics
ResumoAbstract An improvement of a conventional trochoidal electron monochromator is presented. In trapped-electron spectra the fwhm is now reduced to 100 meV, even in the presence of reactive gases. Electron excitation and resonance processes have been studied in ethylene, fluoroethylene, 1,1-difluoroethylene and chlorotrifluoroethylene. Singlet and triplet levels of the first Rydberg state can be resolved in the threshold spectrum, due to resonance excitation and the improved energy resolution. Vibronic structure is reported in the transition to the 1 B 1g state in ethylene. Some optically forbidden valence shell transitions have been discovered around 8.5 eV in 1,1-difluoroethylene and chlorotrifluoroethylene.
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