Abstract
We have used quantum evaporation to investigate the two-dimensional fermion system that forms at the free surface of (initially isotopically pure) 4He when small quantities of 3He are added to it. By measuring the first-arrival times of the evaporated atoms, we have determined that the 3He– 3He potential in this system is V 3 S /k B =0.23±0.02 K nm 2 (repulsive) and estimated a value of m 3S=(1.53±0.02) m 3 for the zero-coverage effective mass. We have also observed the predicted second layer-state which becomes occupied once the first layer-state density exceeds about 0.6 monolayers.
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