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Current limitations on the density of stabilized spin-polarized deuterium (D/sub arrow-down/) to approx.10/sup 14/ atoms/cm/sup 3/ are shown to arise from condensation on the /sup 4/He surface and subsequent recombination. A new technique for measuring the adsorption energy is employed to provide the first such measurement for D/sub arrow-down/ on helium, yielding epsilon/sub a//k/sub B/=2.5 +- 0.4 K.

Spin-Polarized Atomic Deuterium: Stabilization, Limitations on Density, and Adsorption Energy on Helium