Kernrelaxation und Molekülbewegungen in Lösungen freier Radikale

Abstract

The frequency- and temperature-dependences of the nuclear relaxation times have been studied in several solutions of free radicals. Whilst the major contribution to the relaxation is in most systems from dipolar nuclear-electron coupling modulated by translational diffusion, rotational tumbling of solvent-radical complexes is more effective in solutions of water. The work confirms former conclusions from dynamic nuclear polarization studies. Moreover the validity of the STOKES-EINSTEIN formula is tested which is an excellent tool for the calculation of correlation times.