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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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The mass analyzer is a crucial component of the mass spectrometer. In the ionization chamber, the vaporized sample is bombarded with a high-energy electron beam to generate a radical cation and further fragment into neutral molecules, radicals, and cations. A series of negatively charged accelerator plates accelerate the cations into the mass analyzer. The mass analyzer separates ions according to their mass-to-charge (m/z) ratios and then directs them to the detector. The common types of mass...
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X-ray spectrometer having 12 000 resolving power at 8 keV energy.

John F Seely1, Lawrence T Hudson2, Albert Henins2

  • 1Artep, Inc., 2922 Excelsior Springs Court, Ellicott City, Maryland 21042, USA.

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Summary

This study demonstrates a compact x-ray spectrometer achieving high resolution for copper K-alpha spectra. It achieved a resolving power of 12,000 using a silicon transmission crystal, with potential for 20,000.

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Area of Science:

  • Atomic Physics
  • X-ray Spectroscopy
  • Materials Science

Background:

  • High-resolution x-ray spectroscopy is crucial for understanding electronic structures.
  • Previous compact spectrometers lacked sufficient resolving power in the hard x-ray region.

Purpose of the Study:

  • To develop and characterize a compact x-ray spectrometer with enhanced resolving power.
  • To investigate and minimize broadening mechanisms in transmission crystal x-ray spectroscopy.

Main Methods:

  • Utilized a thin silicon transmission crystal (50 microm) with (331) planes for diffraction.
  • Recorded high-resolution Cu Kα spectra from a laboratory x-ray source.
  • Analyzed spectral line components from single- and double-vacancy transitions.

Main Results:

  • Achieved a resolving power of 12,000 with intrinsic crystal broadening as low as 0.67 eV.
  • Identified source height and crystal apertured height as primary broadening contributors.
  • Demonstrated potential for 0.4 eV broadening (20,000 resolving power) by optimizing geometry.

Conclusions:

  • The developed spectrometer offers the highest resolving power for a compact, single transmission crystal in the hard x-ray range.
  • Optimizing geometrical factors significantly reduces spectral broadening.
  • Further improvements can lead to even higher resolution, enabling detailed electronic structure studies.