Ultra-Low-Field NMR Relaxation and Diffusion Measurements Using an Optical Magnetometer Paul J. Ganssle, Hyun D. Shin, Scott J. Seltzer, Vikram S. Bajaj, Micah P. Ledbetter, Dmitry Budker, Svenja Knappe, John Kitching, and Alexander Pines ABSTRACT Nuclear magnetic resonance (NMR) relaxometry and diffusometry are important tools for the characterization of heterogeneous materials and porous media, with applications […]