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Related Concept Videos

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...
Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
There are three main types of inductively coupled plasma atomic emission spectroscopy  (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used.
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...

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Related Experiment Video

Updated: Jun 27, 2026

Building Langmuir Probes and Emissive Probes for Plasma Potential Measurements in Low Pressure, Low Temperature Plasmas
08:10

Building Langmuir Probes and Emissive Probes for Plasma Potential Measurements in Low Pressure, Low Temperature Plasmas

Published on: May 25, 2021

Laser-heated emissive plasma probe.

Roman Schrittwieser1, Codrina Ionita, Petru Balan

  • 1Institute for Ion Physics and Applied Physics, Association EURATOM-OAW, University of Innsbruck, A-6020 Innsbruck, Austria.

The Review of Scientific Instruments
|December 3, 2008
PubMed
Summary

Laser-heated emissive probes offer enhanced plasma diagnostics. This new method provides higher temperatures, longer lifetimes, and faster responses for measuring plasma potential and turbulence in laboratory plasmas.

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Area of Science:

  • Plasma Physics
  • Diagnostic Techniques

Background:

  • Emissive probes are crucial for measuring plasma potential in laboratory settings.
  • Traditional resistive heating limits probe performance, especially in harsh plasma environments.

Purpose of the Study:

  • To develop and evaluate laser-heated emissive probes for plasma diagnostics.
  • To investigate the advantages of laser heating over conventional resistive heating for emissive probes.

Main Methods:

  • Utilized an 808 nm infrared diode laser (up to 50 W) to heat emissive probes.
  • Mounted a laser-heated probe with a lens system on a movable shaft for radial profiling.
  • Measured plasma potential and oscillations in a linear helicon discharge.

Main Results:

  • Achieved higher probe temperatures without evaporation or melting, leading to increased emissivity and probe lifetime.
  • Observed no probe deformation in magnetic fields and no potential drop along the probe wire.
  • Demonstrated faster time response compared to traditional emissive probes.
  • Successfully measured radial profiles of plasma potential and its oscillations.

Conclusions:

  • Laser-heated emissive probes offer significant advantages over traditional resistive heating methods.
  • This technique enhances probe performance, enabling more accurate and reliable plasma diagnostics.
  • The developed probes are suitable for measuring plasma potential and turbulence in various plasma devices.