Non-linear etch process of MF particles embedded in an rf plasma with oxygen admixture

The charge-to-mass ratio of microparticles confined in the sheath of an RF plasma is the key parameter for the understanding and theoretical description of dusty plasmas. Standard techniques, like the resonance method (RM) and the phase-resolved resonance method (PRRM) based upon the harmonic oscillator model of the microparticle, are used to determine the charge-to-mass ratio. However, if high precision is required, these methods become relatively slow. In this work, we present two transient response-based methods, the step excited oscillation method, adapted and modified from Meijaard et al. [Phys. Plasmas 28, 083502 (2021)], and the new pulse excited oscillation method (PEOM). A careful comparison to the PRRM and others is presented. The PEOM offers a significant increase in speed while maintaining a precision comparable to that of the PRRM.

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Structural transformation of dusty plasma crystal in dc discharge plasma by changing confinement ring bias

Jaiswal,

Belt,

Kananovich

et al. 2024

Phys. Rev. Research

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We report an experimental study of the structural transition of a stable complex plasma crystal to a solid-liquid phase coexistence by the controlled adjustment of the confinement potential, while keeping all other parameters constant. The experiments are carried out on a tabletop linear dusty plasma experimental device, which consists of a circular powered electrode and an extended grounded cathode plate. A stationary crystal of melamine formaldehyde particles is formed in a background of argon plasma inside a confining ring that is isolated from the cathode by a ceramic cover. The stable crystal structure breaks in the core region and transitions to a coexistent state by carefully changing the confining potential, thereby modifying the sheath structure. The transition is confirmed by evaluating the variation in different characteristic parameters such as the pair correlation function, local bond order parameter, and dust kinetic temperature as a function of confining bias potential. It is found that melting in the core is due to the onset of dust fluctuations in the layers beneath the topmost layer, which grow in amplitude as the confining bias potential is reduced below a threshold value. The present technique of changing confinement provides a unique feature to study structural transitions of plasma crystals without affecting the overall plasma parameters. Published by the American Physical Society 2024

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Non-linear etch process of MF particles embedded in an rf plasma with oxygen admixture

Cited by 3 publications

References 33 publications

From a single dust grain to basic thermodynamics

From a single dust grain to basic thermodynamics

Pulse excited oscillation: A new high-precision excitation method for the charge-to-mass ratio determination of microparticles in plasma and comparison to stepwise excitation and the phase-resolved resonance method

Structural transformation of dusty plasma crystal in dc discharge plasma by changing confinement ring bias

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