β Scribed by Larry R. Dalton; Alvin L. Kwiram; Jerry A. Cowen
No coin nor oath required. For personal study only.
The results of an extensi& investigation of eIectron reIaxation in radiation-damaged organic materials are pmsented. The recovery of electron magnetization foLIowinS puked saturation is determined (a) by Heisenberg exchange or molecular reorientation-induced spectral diffusion (cross relaxation) and (b) by the spin-lattice rekxation (SLR) processes characteristic of the material examined. Spectral diffusion quenching procedures were employed to minimize the effects of (a), thus permitting measurement of SLR times Local mode effects, torsional oscillations 3ndlor exchange interactions between radicals, as weil as direct and Raman spin-phonon processes contribute to the observed temperature dependence of the SLR times for the approximately twenty radical systems studied. The frequently observed quadratic temperature dependence of the SLR rates is particularly noteworthy.
Two mechanisms that give rise to such behavior have been explored theoretically and are discussed briefly.
π SIMILAR VOLUMES
A series of the d 6 iron(I1) complexes with bulky organic ligands (like [ Fe(bzpy),(NCS),]) can exist in two spin forms: in the low-spin ( S = 0) form at low temperature and in the high-spin ( S = 2) form at high temperature. In the crystal phase, the transition between these two forms may be either