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Related Concept Videos

Atomic Emission Spectroscopy: Overview01:20

Atomic Emission Spectroscopy: Overview

Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
Inductively Coupled Plasma Atomic Emission Spectroscopy: Principle01:19

Inductively Coupled Plasma Atomic Emission Spectroscopy: Principle

Inductively coupled plasma (ICP) is the most widely used plasma source in atomic emission spectroscopy (AES), also known as Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES). The ICP source, or torch, consists of three concentric quartz tubes with argon gas flowing through them. A spark from a Tesla coil initiates the ionization of argon, generating a high-temperature plasma.
The ions and electrons produced interact with the fluctuating magnetic field created by a water-cooled...
Atomic Emission Spectroscopy: Lab01:29

Atomic Emission Spectroscopy: Lab

AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
Atomic Nuclei: Nuclear Spin State Population Distribution01:14

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Types of Radioactivity03:23

Types of Radioactivity

The most common types of radioactivity are α decay, β decay, γ decay, neutron emission, and electron capture.
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Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis. This...

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Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry
07:17

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Published on: August 1, 2017

Electron cooling in decaying low-pressure plasmas.

Yusuf Celik1, Tsanko V Tsankov, Mitsutoshi Aramaki

  • 1Institute for Plasma and Atomic Physics, Ruhr University Bochum, 44780 Bochum, Germany. Yusuf.Celik@rub.de

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|June 12, 2012
PubMed
Summary

An analytical model accurately predicts electron cooling in decaying plasmas. Electron thermalization in late afterglows results from ion fluid coupling via Coulomb collisions, not neutral gases.

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Area of Science:

  • Plasma Physics
  • Fluid Dynamics

Background:

  • Evaporative electron cooling is crucial in low-pressure plasmas.
  • Understanding electron thermalization mechanisms is essential for plasma modeling.

Purpose of the Study:

  • To develop a simple analytical fluid dynamic model for evaporative electron cooling.
  • To validate the model against simulations and experimental data.
  • To investigate electron thermalization in late afterglows.

Main Methods:

  • Development of an ab initio analytical fluid dynamic model.
  • Comparison with a two-dimensional fluid simulation.
  • Validation using experimental data for argon plasma.

Main Results:

  • The analytical model and simulation accurately reproduce measured electron temperature and density.
  • Electron thermalization in the late afterglow is primarily driven by Coulomb collisions with the ion fluid.
  • Coupling to the neutral background is not the dominant thermalization mechanism at high electron densities.

Conclusions:

  • The developed analytical model provides a reliable tool for studying evaporative electron cooling.
  • Coulomb collisions with ions are the key to electron thermalization in dense, late afterglow plasmas.
  • The findings refine understanding of energy loss processes in decaying plasmas.