Experimental Observation of a Peculiar Effect in Saturated Electron Paramagnetic Resonance Spectra Undergoing Spin Exchange. Magnetic Polariton?

Abstract

We report the experimental observation of a spectral manifestation of a magnetic polariton that was theoretically predicted last year. This unprecedented manifestation is demonstrated not only for 15N-enriched peroxylamine disulfonate, a radical that adheres strictly to the assumptions of the theory, but also for a radical, 4-oxo-2,2,6,6-tetramethylpiperidine-d 16;1-15N-1-oxyl, that departs somewhat from the assumptions, as well as the Galvinoxyl radical that represents a severe departure. The magnetic polariton is likely to be of interest to physical chemists in other fields because of the intrinsic advantage of a finite basis set in developing theories.

Experimental confirmation of the formation of a spin polariton in dilute solutions of paramagnetic particles

“…Experimental data obtained in ref. 32 confirm the appearance of the dependence of resonant frequencies on the power of the MW field. However from the analysis of experimental data obtained for 15N-enriched peroxylamine disulfonate, a radical that adheres strictly to the assumptions of the theory, 30,31 the authors of ref.…”

“…Using this criterion, the formation of spin polaritons is shown in ref. 32. For three solutions of paramagnetic particles, the shape of the EPR spectra was measured by varying the power of the MW field and the dependence of the frequency of the resonance lines of the spectrum on the MW power was established.…”

“…However from the analysis of experimental data obtained for 15N-enriched peroxylamine disulfonate, a radical that adheres strictly to the assumptions of the theory, 30,31 the authors of ref. 32 proposed a phenomenological equation to describe this effect (see eqn (1) in ref. 32) which is in disagreement with the theory.…”

“…32 proposed a phenomenological equation to describe this effect (see eqn (1) in ref. 32) which is in disagreement with the theory. 30,31 According to eqn (1) in ref.…”

“…30,31 According to eqn (1) in ref. 32 an additional shift of resonance frequencies of polaritons is proportional to the splitting of two spectrum lines which correspond to two collective modes in the linear response limit.…”