Measurement of net electric charge and dipole moment of dust aggregates in a complex plasma

TL;DR

This study measures the net electric charge and dipole moment of dust aggregates in a complex plasma, combining experimental observations with computer modeling to understand dust particle behavior.

Contribution

It introduces a method to determine dust aggregate charge and dipole moments using trajectory analysis and 3D modeling, validated by experimental data.

Findings

Experimental results support computer model predictions.

Dust aggregates exhibit measurable dipole moments and charges.

Behavior of dust aggregates aligns with theoretical models.

Abstract

Understanding the agglomeration of dust particles in complex plasmas requires a knowledge of the basic properties such as the net electrostatic charge and dipole moment of the dust. In this study, dust aggregates are formed from gold coated mono-disperse spherical melamine-formaldehyde monomers in a radio-frequency (rf) argon discharge plasma. The behavior of observed dust aggregates is analyzed both by studying the particle trajectories and by employing computer models examining 3D structures of aggregates and their interactions and rotations as induced by torques arising from their dipole moments. These allow the basic characteristics of the dust aggregates, such as the electrostatic charge and dipole moment, to be determined. It is shown that the experimental results support the predicted values from computer models for aggregates in these environments.