Nonlinear vertical oscillations of a particle in a sheath of a rf discharge

Details Nonlinear vertical oscillations of a particle in a sheath of a rf discharge Nonlinear vertical oscillations of a particle in a sheath of a rf discharge

2001-04-21

arxiv.org/abs/nlin/0104051v1

Phys. Rev. Lett. 85, 4060 (2000)

Nonlinear Sciences

Chaotic Dynamics

11 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.85.4060

A new simple method to measure the spatial distribution of the electric field in the plasma sheath is proposed. The method is based on the experimental investigation of vertical oscillations of a single particle in the sheath of a low-pressure radio-frequency discharge. It is shown that the oscillations become strongly nonlinear and secondary harmonics are generated as the amplitude increases. The theory of anharmonic oscillations provides a good qualitative description of the data and gives estimates for the first two anharmonic terms in an expansion of the sheath potential around the particle equilibrium.

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