The technique of magnetic field modulation of reaction yield (MARY) spectroscopy was employed to obtain the ESR spectrum of squalane holes that are formed under the action of ionizing radiation at room temperature. The spectrum is shown to consist of a single line which is homogenously narrowed due to resonance charge transfer over the solvent molecules with the rate constant exceeding the diffusion-controlled one.
Chem.Phys.Lett. 1997, V.273, Nos.1-2, pp. 25-30

The quantum beats and magnetic field effect on the reaction yield spectroscopy techniques were employed to study the formation of diphenyl sulfide radical cations in squalane solutions under ionizing irradiation. It is demonstrated that the precursors of diphenyl sulfide radical cations are short-lived primary solvent radical cations (holes) with the electron spin resonance spectrum narrowed by the resonance charge transfer reaction. The rate constant of hole scavenging by diphenyl sulfide molecules was measured directly and amounts to 6.1 × 109 M-1 s-1, exceeding the diffusion-controlled one several times. The obtained value is well in line with the data on pulse radiolysis of squalane solutions with optical monitoring of the highly mobile precursor, supporting the hypothesis about the hole nature of the latter.
J.Phys.Chem. A, 1997, V.101, No.42, pp.7711-7717