| Issue |
EPL
Volume 84, Number 5, December 2008
|
|
|---|---|---|
| Article Number | 55001 | |
| Number of page(s) | 6 | |
| Section | Physics of Gases, Plasmas and Electric Discharges | |
| DOI | https://doi.org/10.1209/0295-5075/84/55001 | |
| Published online | 13 November 2008 | |
Mode-spectral analysis of 2D Coulomb clusters with fluctuating charges
School of Physics, The University of Sydney - New South Wales 2006, Australia
Corresponding author: S.Vladimirov@physics.usyd.edu.au
Received:
7
October
2008
Accepted:
31
October
2008
The mode spectra of small 
clusters of dust particles with fluctuating charges are analyzed.
Particular attention is paid to the influence of correlated and uncorrelated charge fluctuations on the oscillation mode spectra of these clusters.
It is found that the main signature of the correlated charge fluctuations is the shift of the
lowest-frequency (shear) mode; other modes are split/shifted according to their mode number and the weight of the shear and compressional parts in their oscillation pattern. This is useful for diagnostics as the character of dust charge fluctuations
extracted from the analysis of the cluster mode spectra provides important information on the
plasma correlation length.
PACS: 52.27.Lw – Dusty or complex plasmas; plasma crystals / 52.27.Gr – Strongly-coupled plasmas / 52.35.-g – Waves, oscillations, and instabilities in plasmas and intense beams
© EPLA, 2008
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