Physica B 284 158-9 (2000).
Monolayers of 3He on the Surface of Bulk Superfluid 4He
School of Physics, University of Exeter, Exeter,
EX4 4QL (UK).
(Submitted 17 June 1999)
We have used quantum evaporation to investigate the two-dimensional fermion system that forms at the free surface of (initially isotopically pure) 4
He when small quantities of 3
He are added to it. By measuring the first-arrival times of the evaporated atoms, we have determined that the 3
He potential in this system is V3S
=0.23±0.02 K nm2
(repulsive) and estimated a value ofm3S
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.
Keywords: liquid helium, surfaces, quantum evaporation, 2-D fermion systems.
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