Simple method to measure the interaction potential of dielectric grains in a dusty plasma

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Show simple item record Zhang, Zhuanhao Qiao, Ke Kong, Jie Matthews, Lorin Hyde, Truell
dc.identifier.citation Physical Review E 82, 036401, 2010 en
dc.description.abstract A simple minimally perturbative method is introduced which provides the ability to experimentally measure both the radial confining potential and the interaction potential between two individual dust particles, levitated in the sheath of a radio-frequency (RF) argon discharge. In this technique, a single dust particle is dropped into the plasma sheath to interact with a second individual dust particle already situated at the system’s equilibrium point, without introducing any external perturbation. The resulting data are analyzed using a method employing a polynomial fit to the particle displacement(s), X(t), to reduce uncertainty in calculation. Employing this technique, the horizontal confinement is shown to be parabolic over a wide range of pressures and displacements from the equilibrium point. The interaction potential is also measured and shown to be well described by a screened Coulomb potential and to decrease with increasing pressure. Finally, the charge on the particle and the effective dust screening distance are calculated. It is shown for the first time experimentally that the charge on a particle in the sheath of an RF plasma decreases with increasing pressure, in agreement with theoretical predictions. The screening distance also decreases with increasing pressure as expected. This technique can be used for rapid determination of particle parameters in dusty plasma. en
dc.publisher Physics Review E en
dc.title Simple method to measure the interaction potential of dielectric grains in a dusty plasma en
dc.type Article en
dc.identifier.doi 10.1103/PhysRevE.82.036401
dc.description.keywords complex plasma en
dc.description.keywords measurement of interaction potential en
dc.description.keywords laser perturbation en
dc.description.keywords interaction potential en

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