Abstract
We determine the rate of b+b+b surface dipole recombination for hydrogen atoms adsorbed on a 4He film. The calculation is based on the Kagan mechanism adapted to a 2(1/2-dimensional initial state. We find a rate constant Lseff=2.7(7)×10-25 cm4 s-1 at B=7.6 T and T=0.4 K, which is roughly a factor
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