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Multifrequency electron spin echo envelope modulation in S=1/2, I=1/2 systems: Analysis of the spectral amplitudes, line shapes, and linewidths
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13.We focus on δ‐function component line shapes because our aim is to clarify the principles which underlie the ESEEM powder patterns. When convolved with a finite‐width component line shape, these powder patterns change as expected—in the same manner as EPR or NMR powder patterns.
14.In principle, our discussion could be carried out in terms of the peak frequencies rather than characteristic angles. Such an approach leads to considerably more complicated and less instructive expressions. The expression for (Eq. 12), characterizes the maxima of outside the match range, and inside it—except for the point where is singular (π‐function component line shapes). Additionally, this expression characterizes the limiting behavior as this singularity and the match range endpoints are approached, and as
15.ENDOR line shapes in the absence of hyperfine enhancements or spinrelaxation anisotropy.
16.Modulations of nuclei reach their maximum amplitudes when the angle between and reaches (Ref. 12). For systems ( not necessarily isotropic): Provided the denominator remains finite (and ), zero when and conversely.
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