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

将具有负电荷和比液氦（LHe）更大质量密度的100微米大小的粒子落在LHe表面上。在这里，尘埃颗粒和LHe表面被从热灯丝或射频等离子体发射的电子充电。发现这些颗粒的电荷小于在室温下测量的电荷。此外，通过在LHe表面上施加强向上电场（~几kV/cm），建立了在LHe表面附近具有漂浮颗粒的系统。

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.