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- W602503206 abstract "Dusty plasma typically consists of electrons and ions with micron-size charged dust particles. Due to complex inter-species interactions, the system accommodates richphenomena such as formation of strongly-coupled states, structural phase transition, formation of linear and non-linear waves, and anomalous diffusion behavior thatviolates the Fick’s law. Particles motion in dusty plasma can be modeled using Brownian motion, but this model is inadequate to fully capture the detailed dynamics. Inthis study, charged dust particle dynamics is investigated using stochastic process with fractal characteristics based on the fractional calculus. Dusty plasma is generated usinga capacitively coupled 13.56 MHz radio frequency (rf) gas discharge system and different particle states are observed by varying the neutral gas pressure. Particle motionare probed by monitoring the intensity fluctuation of scattered light in dynamic light scattering (DLS) experiment and particle trajectories obtained from particle tracking using digital video camera. In DLS experiment, particle transport mechanisms are deduced by fitting empirical intensity correlation functions using different transport models, which include purely ballistic, purely diffusive, and hybrid ballistic-diffusive transport model with the assumption of monodisperse particles. The hybrid model is found to be most accurate in describing the particle transport. A new correlation model based on a non-standard fractional Langevin equation is introduced to model polydisperse dust particles dynamics. In particle tracking experiment, time-dependent scaling behavior in particles’ mean-square-displacement (MSD) is observed. This is consistent with the results from DLS experiment that shows dust particles undergo fast ballistic transport at short time scale and slow dynamic at longer time duration.Transient anomalous diffusion is described using a simple generalization of Riemann-Liouville fractional Brownian motion. The study is concluded with a brief discussion onhow the DLS and MSD approaches can be corroborated to give useful insights into complex particle transport in dusty plasmas." @default.
- W602503206 created "2016-06-24" @default.
- W602503206 creator A5026339792 @default.
- W602503206 date "2013-01-01" @default.
- W602503206 modified "2023-09-23" @default.
- W602503206 title "Study of particle dynamics in dusty plasma system using stochastic models / Chew Wei Xiang" @default.
- W602503206 hasPublicationYear "2013" @default.
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