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- W2019900915 abstract "The EPR responses of inhomogeneously broadened electron spin systems are considered in detail under the assumption that a spin temperature situation in the rotating reference frame obtains in the constituent spin packets. Expressions are derived for the rapid passage and slow passage responses of such systems, including situations where magnetic field modulation and subsequent phase sensitive first harmonic detection is employed. It is shown that for rapid passage situations in which ωm T1 ≫ 1 (where ωm is the angular frequency of the magnetic field modulation) a dispersive response n out of phase with the modulation is obtained, whereas when ωm T1 ≪ 1 a response is obtained in quadrature with the modulation, both of which are in close agreement with experiment. Further, in very inhomogeneously broadened systems the first harmonic dispersive response has an absorption type shape given by G(Δ), where G(Δ) describes the inhomogeneous distribution of local fields, which is of the same form as the absorption response obtained under slow passage. In the slow passage regime it is shown that the saturation behavior of the system is strongly dependent on the relative values of the Zeeman spin-lattice relaxation time T1 and the spin-spin reservoir relaxation time Tss. For situations in which T1 = Tss, the saturation behavior of Bloembergen et al. is predicted, whereas when Tss ≪ T1 the saturation behavior observed by Castner is obtained. Finally, techniques that allow measures of the spin packet width, Tss and T1 are discussed." @default.
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- W2019900915 date "1976-03-01" @default.
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- W2019900915 title "Electron paramagnetic resonance in inhomogeneously broadened systems: A spin temperature approach" @default.
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- W2019900915 doi "https://doi.org/10.1016/0022-2364(76)90044-5" @default.
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