Interaction between charged dust particles and plasma on super-fluid liquid helium surface

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Micron-sized particles with negative charge and larger mass density than liquid helium(LHe) were dropped onto the LHe surface. Here, dust particles and LHe surface were charged with electrons emitted from a hot filament or an rf-plasma. The charge of those particles was found to be smaller than those measured at room temperature. Furthermore, a system with floating particles near the LHe surface was established by applying strong upward electric field(～a few kV/cm) on the LHe surface.