The helium-(I) photoelectron spectra of the species (CH&A, where A = C, Si, Ge, Sn and Pb, are reported. The observed bands are assigned using a simple molecular orbital model which eniploys localized bond orbitals as the basis set.* The sample of (CH3)4Pb gave the correct mass spectrometric cracking pattern, and was apparently free of (CH3)6Pbz.
The photoelectron spectra excited by helium 21.2 eV radiation in the group IV halides, AB4, where A = C, Si, Ge, Sn, Ti and B = C1, Br, have been determined. The ionization potential data are discussed in terms of a simple molecular orbital description of the electronic structures.
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