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Related Concept Videos

Inductively Coupled Plasma–Mass Spectrometry (ICP–MS): Overview01:19

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In inductively coupled plasma–mass spectrometry (ICP–MS), an inductively coupled plasma (ICP) torch is used as an atomizer and ionizer. Solid samples are dissolved and volatilized before being introduced into the high-temperature argon plasma, while solution samples are nebulized and passed through the high-temperature argon plasma. Plasma dissociates the analytes and ionizes their component atoms to form a mixture of positive ions and molecular species. The positive ions are then...
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Inductively coupled plasma–mass spectrometry (ICP–MS) is a highly selective and sensitive technique for accurate elemental analysis. Though the analysis of ICP–MS mass spectra is comparatively straightforward, it is affected by spectroscopic and non-spectroscopic interferences. Spectroscopic interferences arise when the plasma contains ionic species with an m/z value the same as the analyte ion. Spectroscopic interference can be categorized as isobaric, polyatomic ions, and...
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Inductively Coupled Plasma Atomic Emission Spectroscopy: Principle01:19

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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.
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Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

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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).
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Atomic Emission Spectroscopy: Interference01:30

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In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
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Atomic Emission Spectroscopy: Instrumentation01:22

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The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
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Experimental Methods of Dust Charging and Mobilization on Surfaces with Exposure to Ultraviolet Radiation or Plasmas
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Dust interferometers in plasmas.

M Chaudhuri1, V Nosenko2, H M Thomas2

  • 1School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USA.

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|April 15, 2016
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Summary
This summary is machine-generated.

This study introduces an interferometric imaging method for measuring dust particle diameters in plasma. The technique analyzes defocused images to determine particle size, applicable to both Earth and microgravity conditions.

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Area of Science:

  • Plasma physics
  • Optical diagnostics
  • Materials science

Background:

  • Accurate measurement of dust particles in plasma is crucial for understanding complex plasma behavior.
  • Existing methods for particle size determination can be time-consuming or limited in scope.

Purpose of the Study:

  • To develop a novel, rapid interferometric imaging technique for measuring individual spherical dust particle diameters in gas discharge plasma.
  • To establish a method applicable to a wide range of particle sizes, including sub-micron particles.

Main Methods:

  • Utilizing defocused image analysis of spherical dust particles and their binary agglomerates.
  • Observing stationary interference fringe patterns for particles above a critical diameter.
  • Analyzing rotational interference fringe patterns for particles below the critical diameter, specifically on binary agglomerates.

Main Results:

  • The number of stationary fringes directly correlates with particle diameter for larger particles.
  • Rotational fringe patterns on binary agglomerates allow measurement of smaller particles.
  • A lower cutoff limit for particle diameter measurement using rotational fringes was identified.

Conclusions:

  • The proposed interferometric imaging technique provides an instant and accurate method for dust particle size measurement in plasma.
  • This diagnostic tool is suitable for complex plasma experiments conducted on Earth and in microgravity environments.
  • The method offers a significant advancement in in-situ plasma diagnostics.