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Related Concept Videos

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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In gas chromatography, different detectors are employed to meet specific analytical needs. These detectors are often categorized based on their detection mechanisms and the types of compounds they are best suited to analyze. Thermal Conductivity Detectors (TCD), Flame Ionization Detectors (FID), and Electron Capture Detectors (ECD) represent common categories, each with unique operating principles and applications. However, beyond these, several other detectors are designed for more specialized...
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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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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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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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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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InGaP (GaInP) mesa p-i-n photodiodes for X-ray photon counting spectroscopy.

S Butera1, G Lioliou2, A B Krysa3

  • 1Semiconductor Materials and Devices Laboratory, School of Engineering and Informatics, University of Sussex, Brighton, BN1 9QT, UK. S.Butera@sussex.ac.uk.

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Summary

This study introduces the first Indium Gallium Phosphide (InGaP) photon-counting X-ray photodiode, demonstrating its effectiveness for X-ray spectroscopy. The developed InGaP devices achieve excellent energy resolution, paving the way for advanced X-ray detection applications.

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Area of Science:

  • Semiconductor Physics
  • X-ray Detection Technology
  • Photon Counting Spectroscopy

Background:

  • Photon-counting X-ray detectors are crucial for advanced spectral imaging.
  • Indium Gallium Phosphide (InGaP) offers potential for high-performance semiconductor devices.

Purpose of the Study:

  • To develop and characterize the first InGaP photon-counting X-ray photodiode.
  • To evaluate its suitability for X-ray spectroscopy applications.

Main Methods:

  • Fabrication of InGaP p+-i-n+ mesa photodiodes (200 μm and 400 μm diameters).
  • Characterization using an 55Fe radioisotope X-ray source at room temperature.
  • Spectra accumulation and energy resolution measurement (FWHM) at various reverse biases.
  • System noise analysis and computation of noise contributions.

Main Results:

  • Successfully developed InGaP photon-counting X-ray photodiodes.
  • Achieved an energy resolution of 900 eV (FWHM) at 5.9 keV for 200 μm devices at reverse biases > 5 V.
  • Demonstrated suitability for photon-counting X-ray spectroscopy when coupled with a low-noise preamplifier.

Conclusions:

  • InGaP photodiodes are a viable technology for photon-counting X-ray spectroscopy.
  • The developed devices exhibit promising energy resolution for X-ray detection.
  • Further noise analysis provides insights for detector optimization.