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Low-energy electron-impact excitation spectra of formaldehyde,acetaldehyde and acetone
Authors:EH Van Veen  WL Van Dijk  HH Brongersma
Institution:Department of Theoretical Organic Chemistry, University of Leyden, Leyden, The Netherlands
Abstract:Threshold electron-impact excitation spectra, transmission spectra and n→n* excitation functions are presented for formaldehyde, acetaldehyde and acetone. Formation of temporary negative ion states and their decay-channels are discussed. The electronic transition near 4 eV is shown to be due both to triplet and singlet n→n* excitation. The energy positions of the 3n→n* and first triplet Rydberg transition are accurately located. In formaldehyde a new transition is reported at 8.50 eV. Assignments are given for the observed electronic excitation processes.
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