Estimation of lifetimes of solvent radical cations in liquid alkanes using the level crossing spectroscopy technique

Simple rules for resolved level-crossing spectra in magnetic field effects on reaction yields

“…Such lines were later indeed experimentally observed in several systems by two teams (Stass et al, 1995b;Saik et al, 1995;Grigoryants et al, 1998;Kalneus et al, 2006a). Furthermore, in a subsequent paper (Tadjikov et al, 1996) it was suggested and demonstrated in numeri-D. V. Stass et al: Simple rules for level crossing spectra cal simulations for several systems of simple structure, and confirmed in a proof-of-principle experiment, that hyperfine structure of the second pair partner may be revealed at the level-crossing lines. The earliest mention of the very possibility of observing a resolved structure on a level-crossing line for a radical pair was probably the paper on MFE in a Ge-containing pair induced by a large difference in g values of the pair partners (Shokhirev et al, 1991), where a levelcrossing line appeared in modeling.…”

Magnetic field modulation of the delayed fluorescenceyield in the photoionization reaction of N, N, N′, N′‐tetramethyl‐p‐phenylenediamine in water

“…The shape and position of these lines are determined by the same parameters as the EPR spectrum of the pair. However, in contrast to EPR spectroscopy, the lines are formed due to spin evolution driven by the hyperfine interactions (hfi) in the partners of the pair, which exceed the maximum attainable microwave field by 1-2 orders of magnitude [13]. Consequently, the technique allows registration of radical ions with lifetimes as short as 1 ns without need for pulsed methods.…”

Radiation chemistry of organic liquids: Saturated hydrocarbons

“…This long lifetime and the high mobility of the cycloalkane holes makes it possible to study their reactions using microwave [7][8][9] or direct current (dc) [10][11][12][13][14][15][16][17][18][19] conductivity, an option that does not exist for other hydrocarbons. Indeed, in room-temperature paraffins, the solvent holes have natural lifetimes ranging from 1 ns (C 5 ) to 33 ns (C 16 ) [20,21] due to rapid dissociation of the C-C or C-H bond(s) and deprotonation, RH^+ + RH ---" R^ + RH 2 +…”