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Related Concept Videos

IR Spectrometers01:25

IR Spectrometers

There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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Total internal reflection fluorescence microscopy or TIRF is an advanced microscopic technique used to visualize fluorophores in samples close to a solid surface with a higher refractive index, such as a glass coverslip. TIRF only allows fluorophores in proximity to the solid surface to be excited. When light from a medium with a lower refractive index (such as air) hits the glass coverslip at a critical angle, the light undergoes total internal reflection stead of passing through the glass.

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Electron Spin Resonance Micro-imaging of Live Species for Oxygen Mapping
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Imaging spin filter for electrons based on specular reflection from iridium (001).

D Kutnyakhov1, P Lushchyk, A Fognini

  • 1Johannes Gutenberg-Universität, Institut für Physik, 55099 Mainz, Germany.

Ultramicroscopy
|May 4, 2013
PubMed
Summary
This summary is machine-generated.

This study introduces a novel polarimeter for electron spin analysis, overcoming limitations of existing devices. The new design enables full image transport, advancing electron microscopy and spectroscopy.

Keywords:
Hemispherical electron energy analyzerImaging spin filterIr (001)Multichannel spin detection

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Area of Science:

  • Physics
  • Materials Science
  • Surface Science

Background:

  • Electron spin analysis is crucial but challenging, as traditional Stern-Gerlach filters are ineffective for electrons.
  • Current polarimeters are single-channel, limiting compatibility with advanced imaging and spectroscopic techniques.
  • Existing methods suffer from a low figure of merit (FoM), hindering precise spin analysis.

Purpose of the Study:

  • To develop a novel polarimeter capable of transporting a full electron image for enhanced spin analysis.
  • To address the limitations of single-channel polarimeters in modern electron microscopy and spectroscopy.
  • To utilize spin-dependent scattering processes for improved electron beam spin characterization.

Main Methods:

  • Development of a novel polarimeter utilizing k-parallel conservation in low-energy electron diffraction (LEED).
  • Investigation of specular reflection from Ir(001) as a spin-filter crystal.
  • Experimental measurements at specific scattering energies (39 eV and 10 eV).
  • Relativistic layer-KKR SPLEED calculations for theoretical validation.

Main Results:

  • The novel polarimeter successfully transports a full image, demonstrating compatibility with parallel imaging.
  • Specular reflection from Ir(001) exhibits high analyzing power and stability in ultra-high vacuum.
  • Optimal working points identified at 39 eV (broad maximum) and 10 eV (higher FoM).
  • Theoretical calculations show good agreement with experimental measurements.

Conclusions:

  • The developed polarimeter offers a significant advancement for electron spin analysis.
  • This technology enhances the capabilities of parallel imaging microscopes and electron spectrometers.
  • The use of Ir(001) provides a robust and effective spin-filtering mechanism.