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VIBRATIONAL MODULATION EFFECTS ON EPR SPECTRA 255
The symmetry assignment of vibrational states refers to point group. Experimental
geometries and wave numbers are taken from [28,29] for and [30] for EPR
parameters are taken from [31] for at 96K and [32] for .at77K.
It is quite apparent (Figures 3,4) that the hyperfine constants of the central and terminal
atoms in the two radicals are strongly influenced by the out-of-plane displacement. For the
central atom, the coupling increases with and this is clearly related to a strong change in
hybridization.
