Simulated electron spin resonance spectra of nitroxide spin labels in slowly reorienting rod shaped molecules

Abstract

E.s.r. spectra of nitroxide radicals with S=½, I= 1 have been simulated for reorientation rates that are insufficient to achieve rapid tumbling. The radical is assumed to be attached to a rod-shaped molecule which is reorienting by strong collisions; these preferentially rotate the molecule about its long axis, giving anisotropic reorientation.