Related Experiment Video
Updated: Dec 8, 2025
08:10
Building Langmuir Probes and Emissive Probes for Plasma Potential Measurements in Low Pressure, Low Temperature Plasmas
Published on: May 25, 2021
5.1K
Kinetic modeling of the electric double layer at a dielectric plasma-solid interface
K Rasek1, F X Bronold1, H Fehske1
1Institut für Physik, Universität Greifswald, 17489 Greifswald, Germany.
Physical Review. E
|September 18, 2020
Summary
We investigated plasma loss in dielectrics, finding that electron-hole recombination within the material forms an electric double layer. This layer influences plasma kinetics and material properties.
Area of Science:
- Plasma physics
- Materials science
- Semiconductor physics
Background:
- Collisionless plasmas interacting with dielectric surfaces.
- Electron and ion kinetics at material interfaces.
- Nonradiative electron-hole recombination in dielectrics.
Purpose of the Study:
- Investigate plasma loss kinetics in dielectrics.
- Analyze the formation of electric double layers at plasma-solid interfaces.
- Understand plasma-induced changes in dielectric charge carrier dynamics.
Main Methods:
- Solving coupled Boltzmann equations for plasma and solid charge carriers.
- Numerical simulation of transport phenomena.
- Analysis of potential, density, and flux profiles.
Main Results:
- Self-consistent electric double layer formation observed.
- Detailed profiles of plasma-dielectric interaction presented.
- Microscopic insights into plasma loss mechanisms derived from distribution functions.
Conclusions:
- Plasma loss is governed by internal recombination and electric double layer dynamics.
- The study provides a microscopic understanding of plasma-dielectric interactions.
- Numerical methods enable detailed analysis of complex kinetic processes.
Related Concept Videos
01:27Electrostatic Boundary Conditions in Dielectrics
1.7K
When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's permittivity....
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's permittivity....
1.7K
01:31Dielectric Polarization in a Capacitor
5.6K
The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
5.6K
01:28Magnetostatic Boundary Conditions
1.5K
An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
1.5K
01:23Electric Field of a Charged Disk
2.9K
The simplest case of a surface charge distribution is the uniformly charged disk. Calculating its electric field also helps us calculate the electric field of a large plane of charge.
The system's symmetry is in the cylindrical directions across the plane of the charge. As a result, the electric fields created by various surface charge elements nullify each other in the direction parallel to the surface. Thereby, the resulting electric field is perpendicular to the plane. Since the disk is...
The system's symmetry is in the cylindrical directions across the plane of the charge. As a result, the electric fields created by various surface charge elements nullify each other in the direction parallel to the surface. Thereby, the resulting electric field is perpendicular to the plane. Since the disk is...
2.9K
01:17Gauss's Law in Dielectrics
4.9K
Consider a polar dielectric placed in an external field. In such a dielectric, opposite charges on adjacent dipoles neutralize each other, such that the net charge within the dielectric is zero. When a polar dielectric is inserted in between the capacitor plates, an electric field is generated due to the presence of net charges near the edge of the dielectric and the metal plates interface. Since the external electrical field merely aligns the dipoles, the dielectric as a whole is neutral. An...
4.9K
01:29Potential Due to a Polarized Object
638
A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
638