Effect of rotational diffusion on acoustic paramagnetic resonance in liquids

Abstract

It is shown that a mechanism exists which gives rise to narrow lines of paramagnetic resonance absorption of longitudinal sound waves, transverse sound waves and temperature waves in a liquid in spite of the rotational diffusion. The observation conditions for these resonances are discussed. The interaction of the molecular orientation with the fluctuations of shear stresses has been found to affect significantly the spin-lattice relaxation rate in a liquid.