The experiments were made possible by a novel, one-layer ion trap cooled to minus 269 C (minus 452 F) with a liquid helium bath.
实验利用了一种单层离子势阱，并将其浸在液氦浴中冷却到零下269摄氏度。
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This paper reviews two dimensional electron gas formed on the liquid helium surface, the semiconductor surface space charge layer and the compound semiconductor heterojunction interface.