Longitudinal Relaxation Time

**Semantic type:** Quantitative Concept

**Definition:** The time it takes for the net nuclear spin in the plane that is parallel to the magnetic field of a spectrometer to return to its equilibrium value.

**Synonyms:** - 1/R1 - Spin-Lattice Relaxation Time - Spin-Lattice Relaxation Time - T1 - T1 - T1 Relaxation Time - T1 Signal - T1 Time