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Related Concept Videos

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

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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).
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....
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Atomic Emission Spectroscopy: Lab01:29

Atomic Emission Spectroscopy: Lab

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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...
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Atomic Emission Spectroscopy: Interference01:30

Atomic Emission Spectroscopy: Interference

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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

Atomic Emission Spectroscopy: Instrumentation

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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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Emission Spectra02:39

Emission Spectra

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When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a range of energies, and thereby produce a continuous spectrum in which an unbroken series of wavelengths is present.
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Atomic Emission Spectroscopy: Overview01:20

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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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Method for Recording Broadband High Resolution Emission Spectra of Laboratory Lightning Arcs
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Linearized spectrum correlation analysis for line emission measurements.

T Nishizawa1, M D Nornberg1, D J Den Hartog1

  • 1Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.

The Review of Scientific Instruments
|September 3, 2017
PubMed
Summary
This summary is machine-generated.

A novel Linearized Spectrum Correlation Analysis (LSCA) method measures fast spectral line shape changes for ion-scale micro-instabilities. This technique enables high-frequency ion velocity measurements, proving effective in simulations and experiments.

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Area of Science:

  • Plasma Physics
  • Spectroscopy
  • Wave Phenomena

Background:

  • Ion-scale micro-instabilities cause rapid fluctuations in spectral line shapes.
  • Existing methods may struggle to resolve these fast dynamics, especially under low photon count conditions.

Purpose of the Study:

  • Introduce a new spectral analysis method, Linearized Spectrum Correlation Analysis (LSCA).
  • Enable measurement of fast spectral line shape changes associated with ion-scale micro-instabilities.
  • Facilitate high-frequency ion velocity measurements.

Main Methods:

  • Linearizing spectral fluctuations around a time-averaged line shape.
  • Subdividing spectral output channels to reduce uncorrelated noise.
  • Evaluating cross-spectra between channel groupings to isolate fluctuating quantities.

Main Results:

  • Successfully performed high-frequency ion velocity measurements (100-200 kHz).
  • Demonstrated the effectiveness of LSCA through simulations comparing it to moment analysis under low photon counts.
  • LSCA effectively resolves fluctuations in emission line shapes from stationary ion-scale waves.

Conclusions:

  • LSCA is an effective method for analyzing fast spectral line shape changes.
  • The technique is suitable for measuring ion velocity fluctuations in plasma environments.
  • LSCA shows promise for studying ion-scale micro-instabilities with high temporal resolution.