SummaryExperimental valence ionisation energies of 143 hydrocarbons, C,H,, have been determined from their He(I1a) (40.80 eV) and He@) (21.22 eV) excited photoelectron spectra. Ionization energies, usually up to 26 eV are given in tabular form for 108 hydrocarbons with n < 6, together with their (tentative) assignment. The ionization energies up to approximately 25 eV, of 35 selected hydrocarbons with 7 < n < 10, are presented by means of their He (IIa) photoelectron spectra.
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