Abstract
Experimental EPR data obtained for the methyl, CH3, radical trapped in quench condensed solid Kr are analyzed rendering the radical a probe for determination of regional disorder in Kr and similar solid matrices. Formation of regions of a highly disordered local matrix structure is proved. An attempt is presented of assessing a disorder parameter, based on the line broadening. The new structure is shown to be very effective in accumulating the radicals which are transiently mobile at the Kr 4.2K surface. We discuss a model of the trapped radical rotation, which includes somewhat different mechanism than the hindrance of the rotation about the C3 axis and the rotation about the in-plane C2 axes. The level of the thermal contact of the radical spin-rotation motion with the lattice degrees of freedom in regions of varying order in the Kr solid matrix was assessed by progressive saturation curve-fitting parameters related to the spin-lattice relaxation time T1 of the radical.
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