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 was 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 was derived. The effect may be of utility in providing an alternate method of control for MRI Tissue Contrast applications with further development.
Highlights
Introduction geometric arguments to be defined asIn contemporary NMR methodologies, it is common to find experimental scenarios where the relaxation of the magnetization during a pulse train is important to be able to model and quantify. (1,2,3) In this note, we suggest that for some molecular species the Rotational Diffusion can be affected and modified by the Magnetic Field Torque of the applied radio- frequency pulse
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 reader may wonder what is a lower bound on the magnetic moment of the particle of Interest for a typical value of the pulse amplitude
Summary
In contemporary NMR methodologies, it is common to find experimental scenarios where the relaxation of the magnetization during a pulse train is important to be able to model and quantify. (1,2,3) In this note, we suggest that for some molecular species the Rotational Diffusion can be affected and modified by the Magnetic Field Torque of the applied radio- frequency pulse. In contemporary NMR methodologies, it is common to find experimental scenarios where the relaxation of the magnetization during a pulse train is important to be able to model and quantify. During the course of working on this concept, it has come to our attention that the Russian investigator Sitnitsky (4) has investigated this phenomenon. This proposed influence may be used in some models for explaining experimental data, such as for Liquid Crystals (14). We note that the proposed effects may be useful as another avenue to control the spin- dynamics of an experimental system while the pulse is on. The proposed effects have been dealt with rigorously in the Physics Literature (15)
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