Abstract
A new experimental approach for obtaining EPR spectra of alkane and alkene radical cations is described. The method consists in irradiating the hydrocarbon studied (octane and tetramethylethylene in this work) in a pentane matrix at 77 K. A substantial amount of the positive ions formed by irradiation will then be trapped as radical cations of the additive. Fairly pure EPR spectra of these radical cations may subsequently be obtained by taking the difference, by computer, between the EPR spectra before and after selective removal of the radical cation by illumination with light of suitable wavelength.
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