The HeI photoelectron spectra of propyl- and isopropyl-benzene have been measured and compared. The two isomers have the same first ionization potential, but show variations in the higher ionization energy range. Comparison with the benzene and propane spectra, aided by the results of SPINDO calculations, indicates that the propylbenzene spectra can be interpreted according to a composite-molecule model.
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Carnovale et al. (1978) studied this question.
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