Abstract Pulsed NMR measurements on very low density films of helium-3 have been performed. Fractions of a full monolayer between 0.005 and 0.070 are reported. Our results indicate that the first percent or so of a monolayer is adsorbed in relatively high density immobile patches. At greater coverages the excess adsorbate forms a two-dimensional gas. For the full range of coverages reported the T 2 relaxation mechanism is the internuclear dipolar interaction of the immobile patches.