Abstract
The off-resonance rotating frame spin-lattice relaxation experiment represents a class of magnetic resonance techniques in which a low-power, continuous-wave radiofrequency (RF) field is applied off-resonance from a selected resonance. Application of such an irradiation field establishes nuclear spin polarization along an effective field inclined at an angle Θ away from the z axis of the rotating frame. In its original form, this approach was employed for the determination of the rotational correlation time, i.e., the rotational diffusion characteristics of a reorienting macromolecule (James et al., 1978; Schleich et al., 1989). More generally, the off-resonance rotating frame spin-lattice relaxation experiment can be thought of as a form of off-resonance saturation, in which a selected resonance is either completely or partially saturated. Viewed in these terms, the off-resonance rotating frame spin-lattice relaxation formalism, modified to include magnetization transfer phenomena, may be used to obtain chemical exchange kinetic and magnetic cross-relaxation information.
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