Basic Concepts
T1 - Relaxation time

Relaxation and Molecular Motion

The relaxation process is induced by field fluctuation due to molecular motion. (The local field experienced by a molecule changes when the molecule reorients)

1- Protons relax with Dipole-Dipole interaction "through space"

This interaction depends on the strength of the dipolar coupling (depends on gamma), on the orientation/distance between the interacting nuclei and on the motion.

Protons that are distant from other nuclei will relax slower than protons that have closer neighbors