Abstract
Relaxation is a general term used to describe the movement of a system toward equilibrium after an injection of energy. When atomic nuclei in a molecule are excited in a pulsed nuclear magnetic resonance (NMR) experiment, the excited state may exist for a rather long time. Characteristic relaxation times estimated in an NMR experiment are used to provide information about molecular motion. This chapter provides a simplified summary of pulsed NMR relaxation and discusses the influence of frequency on deuterium relaxation in D2O solutions of proteins. NMR relaxation provides additional molecular information if it can be done at a series of frequencies. The general observation in NMR frequency dependence experiments in solutions of proteins is that the longitudinal NMR relaxation rates, R1 of 2D nuclei are independent of the field at very low NMR frequencies. As NMR frequency increases, R1 gradually decreases until it becomes independent of the frequency and field strength. This chapter also deals with the applications of NMR in solution as well as solid state.
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