New Information About Manifestations of Spin Exchange in the EPR Spectra of Solutions of Paramagnetic Particles Under Saturation Conditions

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

“…The peculiarities in refs − are only significant when the spectra are both saturated and V is significant. Despite a large experimental and theoretical literature on saturation and likewise on HSE, there have been very few experimental investigations where both phenomena were significant and none of those addressed the presence of DIS until this year .…”

“…21 In the work described here, these two factors conspire to limit V ≈ γA 0 /2, too small to collapse the two-line spectrum where some of the peculiarities that occur for V ≈ γA 0 . 3 Fortunately, the AHE is observable over a considerable range of V < γA 0 ; therefore, that is our focus.…”

“…Furthermore, in all cases thus far studied, except for PADS, all nitroxides were found to re-encounter. 12,13,18−20 Nevertheless, Salikhov 3 notes that, in practice, all 15 N nitroxides are expected to satisfy (1) when V is large compared with the hyperfine coupling constants due to protons (deuterons).…”

“…Spectra are presented as first derivatives. Of several peculiar effects discussed, we treat only one in this Letter: a predicted increase in A abs as saturation increases, an effect that has not been observed experimentally. This effect is a hallmark of the various peculiar effects and for convenience call it the A abs vs H 1 effect (AHE).…”

Autobiography

“…For readers’ convenience, I present a selected list of my publications dealing with the main topics of my long-term research: spin chemistry [ 1 – 22 ]; pulse EPR spectroscopy [ 23 – 38 ]; spin exchange [ 39 – 52 ]; and diverse publications [ 53 – 59 ].…”