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  1. In recent years, the theory of the effect of saturation of EPR spectra of free radicals undergoing spin exchange has been extended to spin exchange frequencies where “peculiar” behavior occurs. In a paper by Salikhov (Appl. Magn. Reson. (2021) 52:1063–1091), analytic expressions were developed that predict the dependence of measurable EPR parameters on the exchange frequencies and the microwave field strength. This work is an experimental test of that theory where, in principle, there are no adjustable parameters. 
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  2. The Dobryakov–Lebedev relation (Sov Phys Doklady 13:873, 1969), which relates the line width of the first-derivative of a Gaussian–Lorentzian convolution to the line widths of its Gaussian and Lorentzian components for an unresolved EPR line, is extended to resolved lines. Applying this extension to nitroxide-free radicals in solutions of low-viscosity solvents offers an opportunity to study interactions of the spins with the microwave field and spin–spin interactions previously inaccessible except by tedious numerical methods. 
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  3. null (Ed.)