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Journal of Applied Physics / Volume 106 / Issue 3 / PLASMAS AND ELECTRICAL DISCHARGES

J. Appl. Phys. 106, 033303 (2009); http://dx.doi.org/10.1063/1.3186022 (6 pages)

Effect of radio frequency discharge power on dusty plasma parameters

T. E. Sheridan

Department of Physics and Astronomy, Ohio Northern University, Ada, Ohio 45810, USA

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(Received 11 May 2009; accepted 26 June 2009; published online 5 August 2009)

The parameters of a two-dimensional dusty plasma consisting of six, 9 μm diameter particles trapped inside a radio frequency (rf) plasma sheath have been measured as a function of rf power in a 13.5 mtorr (1.8 Pa) argon discharge. The center-of-mass and breathing frequencies are found by projecting the cluster’s Brownian motion onto the associated normal mode. The center-of-mass frequency (i.e., radial confinement) is insensitive to rf power. The Debye shielding parameter κ, as found from the breathing frequency, increases from ≈0.5 to 2 as the square root of rf power. The Debye length decreases from ≈2.7 to 0.7 mm as the inverse of the square root of rf power. The average particle charge q ≈ −17 000e is effectively independent of rf power. These results are consistent with an electron temperature that is independent of rf power and an ion density that is directly proportional to rf power, where the Debye length is determined by the ion density in combination with the electron temperature.

© 2009 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. MODELS
    1. Dusty plasma
    2. Particle charging
  3. EXPERIMENT
  4. RESULTS
  5. CONCLUSIONS

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KEYWORDS and PACS

Keywords

Debye temperature, dusty plasmas, high-frequency discharges, plasma confinement, plasma density, plasma sheaths, plasma temperature

PACS

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3186022

PUBLICATION DATA

ISSN

0021-8979 (print)  
1089-7550 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
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