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Micron-size charged particles can be easily levitated in low-density plasmaenvironments. At low pressures, suspended particles have been observed tospontaneously oscillate around an equilibrium position. In systems of manyparticles, these oscillations can catalyze a variety of nonequilibrium,collective behaviors. Here, we report spontaneous oscillations of singleparticles that remain stable for minutes with striking regularity in amplitudeand frequency. The oscillation amplitude can also exceed 1 cm, nearly an orderof magnitude larger than previously observed. Using an integrated experimentaland numerical approach, we show how the motion of an individual particle can beused to extract the electrostatic force and equilibrium charge variation in theplasma sheath. Additionally, using a delayed-charging model, we are able toaccurately capture the nonlinear dynamics of the particle motion, and estimatethe particle's equilibrium charging time in the plasma environment.

The origin of large amplitude oscillations of dust particles in a plasma sheath