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Related Concept Videos

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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Atomic Spectroscopy: Effects of Temperature01:27

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Atomization, converting samples into gas-phase atoms and ions, is essential for atomic spectroscopy. The flame temperature required for atomization affects the efficiency of the atomic spectroscopic methods by increasing the atomization efficiency and the relative population of the excited and ground states.
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Atomic Emission Spectroscopy: Lab01:29

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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 Absorption Spectroscopy: Instrumentation01:22

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An atomic absorption spectrophotometer (AAS) comprises several components: a radiation source, an atomizer, a monochromator, and a detector. The radiation source can be a hollow-cathode lamp (HCL) or an electrodeless-discharge lamp (EDL), both of which provide a narrow emission line of the required wavelength. However, some instruments use continuum sources and high-resolution monochromators to achieve a narrow range of radiation.
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The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
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German physicist Wilhelm Röntgen (1845–1923) was experimenting with electrical current when he discovered that a mysterious and invisible "ray" would pass through his flesh but leave an outline of his bones on a screen coated with a metal compound. In 1895, Röntgen made the first durable record of the internal parts of a living human: an "X-ray" image (as it came to be called) of his wife’s hand. Scientists worldwide quickly began their own experiments with...
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Updated: Jul 12, 2025

Applying X-ray Imaging Crystal Spectroscopy for Use as a High Temperature Plasma Diagnostic
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Electron Temperature Measurements Using a Two-Filter Soft X-ray Array in VEST.

M W Lee1, S Lim2, W Jeong2

  • 1Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea.

Sensors (Basel, Switzerland)
|October 28, 2023
PubMed
Summary
This summary is machine-generated.

A new multichannel soft X-ray (SXR) array effectively measures electron temperature in the Versatile Experiment Spherical Torus (VEST). This SXR array uses a two-filter method, providing accurate temperature data consistent with Thomson scattering measurements.

Keywords:
AXUVbremsstrahlungelectron temperaturesoft X-raytwo-filter method

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Area of Science:

  • Plasma physics
  • Fusion energy research
  • Diagnostic instrumentation

Background:

  • Accurate electron temperature measurement is crucial for understanding and controlling plasma behavior in fusion devices.
  • The Versatile Experiment Spherical Torus (VEST) requires advanced diagnostic tools for plasma characterization.

Purpose of the Study:

  • To develop and validate a multichannel soft X-ray (SXR) array for electron temperature diagnostics in the VEST.
  • To optimize the two-filter method using specific metallic filters for SXR intensity analysis.

Main Methods:

  • Designed a pinhole camera with two photodiode arrays and different metallic filters (aluminum and beryllium).
  • Utilized a filter wheel to test and identify the optimal filter combination for VEST conditions.
  • Employed a low-noise preamplifier for acquiring filtered SXR signals with high signal-to-noise ratios.

Main Results:

  • The aluminum and beryllium filter combination proved most suitable for VEST.
  • The developed SXR array achieved sufficient signal-to-noise ratios for reliable electron temperature estimation.
  • Estimated electron temperatures showed good agreement and consistent trends with Thomson scattering measurements.

Conclusions:

  • The multichannel SXR array is a viable and effective diagnostic for measuring electron temperature in VEST.
  • The two-filter method, with optimized filters, provides accurate plasma temperature data.
  • Further analysis includes the impact of impurity line emission on measurement accuracy.