https://doi.org/10.1351/goldbook.R05287
- In magnetic resonance spectroscopy the longitudinal relaxation time, \(T_{1}\), is associated with spin-lattice relaxation, and the transverse relaxation time, \(T_{2}\), with spin-spin relaxation. The definitions are: \(\frac{\rm{d}M_{z}}{\rm{d}t} = -\frac{M_{z} - M_{z,\rm{e}}}{T_{1}}\) and \(\frac{\rm{d}M_{x}}{\rm{d}t} = -\frac{M_{x}}{T_{2}}\), where \(M_{z}\) and \(M_{x}\) are the components of magnetization parallel and perpendicular to the static field \(B\) and the subscript e denotes the equilibrium value.
- In a chemical reaction, the time, \(\tau \), in which a concentration perturbation falls to \(\frac{1}{\rm{e}}\) of its initial value.