抄録
Nuclear spin relaxation is one of the fundamental aspects of Nuclear Magnetic Resonance (NMR). Transverse relaxation rate governs the linewidth of the resonance, and longitudinal relaxton rate affects the determination of the recycle delay for each acquisition. On the other hand, cross-relaxation causes the nuclear Overhauser effect (NOE) which gives us distance information used for the 3D structure determination of molecules. Recently, crosscorrelated relaxation has been effectively utilized to develop novel NMR mesaurements. In this review, semi-classical treatment of relaxation theory is briefly intuoduced, and by utilizing the derived double commutator operation, various aspects of nuclear spin relaxation are investigated in terms of molecular motions.
