Effect of RF Fields during Pulse on Rotational Diffusion: Influence on Spectral Density

Abstract

The effect of the applied RF field in an NMR experiment on the magnitude of the Spectral Density for a Dipolar Relaxation Mechanism is demonstrated theoretically. The effect is shown with Sin Cos Pulse as a concrete example. The order of magnitude of the magnetic moment where these effects will be significant for typical Rf amplitude values is derived. The effect may be of utility in providing an alternate method of control for MRI Tissue Contrast applications with further development.