EXCITATION OF ETHYLENE, ACETYLENE, PROPYNE, AND 1-BUTYNE BY LOW-ENERGY ELECTRON IMPACT.
Abstract
The excitation spectra of ethylene, acetylene, propyne, 1-butyne, 2-butyne, and 3-hexyne were measured by means of a trapped-electron technique which permits the detection of approximately 93 percent of inelastically scattered electrons independent of scattering angle. Excitation potentials and relative intensities are tabulated for both optically allowed and optically forbidden transitions. Correlation with available ultraviolet absorption data and molecular-orbital theory is used to establish transition assignment. A 1.7-ev excitation in ethylene is attributed to temporary negative-ion formation. In acetylene at 2.0 ev, excitation is postulated as resulting from excitation of the triplet sigma (+) u state. Lowenergy maxima occur in propyne, 1-butyne, 2-butyne; however, the complexity of these molecules precludes a meaningful assignment of transitions at this time. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1965
- Accession Number
- AD0612070
Entities
People
- C. R. Bowman
- W. D. Miller
Organizations
- General Dynamics