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We have performed magnetic compression experiments with the two-dimensional gas of hydrogen atoms on liquid ⁴He at T0ex0ex=0ex0ex120--200mK. For 2D phase-space densities higher than 3, the probability of three-body dipole recombination is observed to decrease gradually by an order of magnitude in comparison to its low-density value Kbbb0ex0ex=0ex0ex8.4(3.5)×10^-25cm⁴s^-1. This is attributed to local coherence developing in a 2D quasicondensate. We have also determined the value U/k0ex0ex=0ex0ex5.1(5)×10^-15Kcm² for the mean-field energy of the gas.
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Safonov et al. (1998) studied this question.
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