Abstract
The determination of rotational correlation times and activation energies by means of ESR line widths has been investigated in detail for di- t-butyl nitroxide and for four spin labels in solution. Consistent correlation times can be obtained only if the parameters b and Δγ in the spin Hamiltonian are determined separately for each radical solvent system. Line width corrections to account for unresolved hyperfine structure were found to affect significantly the apparent activation energies for rotation.
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