Spin dynamics of paramagnetic centers with anisotropic g tensor and spin of 1/2

► With g-anisotropy, electron spin and magnetic moment generally behave differently. ► Spins precess in one direction on a circular path perpendicular to g↔TB→0/geff. ► Magnetic moment precesses in an elliptical path perpendicular to B0. ► The orientation of B1 relative to g does matter. ► CW EPR spectra are slightly different from the FT spectra.