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A scanning electron microscope (SEM) is used to study the surface features of a sample by using an electron beam that scans the sample surface in a two-dimensional manner. Typically, areas between ~1 centimeter to 5 micrometers in width can be imaged. SEM can be used to image bacteria, viruses, tissues as well as larger samples like insects. Conventional SEM gives a magnification ranging from 20X to 30,000X and spatial resolution of 50 to 100 nanometers.
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In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
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An electron paramagnetic resonance mobile universal surface explorer.

Lauren E Switala1, Baron E Black1, Celia A Mercovich1

  • 1Magnetic Resonance Laboratory, Rochester Institute of Technology, Rochester, NY 14623-5604, United States.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|October 25, 2017
PubMed
Summary
This summary is machine-generated.

A new portable electron paramagnetic resonance (EPR) spectrometer, the EPR MOUSE, allows non-destructive surface analysis of large or precious samples. This mobile device enables low frequency EPR (LFEPR) studies directly on objects, expanding research possibilities.

Keywords:
EPR MOUSELFEPRSurface EPRUnilateral EPR

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Area of Science:

  • Analytical Chemistry
  • Materials Science
  • Spectroscopy

Background:

  • Electron paramagnetic resonance (EPR) spectroscopy is limited by sample size and the need for destructive sampling.
  • Many valuable or large samples are inaccessible to traditional EPR spectrometers.

Purpose of the Study:

  • To develop a mobile, non-destructive EPR spectrometer for analyzing large and precious samples.
  • To demonstrate the capabilities of the EPR MOUSE on diverse materials.

Main Methods:

  • Construction of an EPR mobile universal surface explorer (MOUSE), a unilateral EPR spectrometer.
  • Non-destructive recording of low frequency EPR (LFEPR) spectra by placing the MOUSE against the sample surface.

Main Results:

  • The EPR MOUSE successfully analyzed paramagnetic paint pigments on canvas.
  • Magnetic ink on paper and a ceramic candlestick were also studied.
  • Demonstrated the ability to obtain LFEPR spectra from specific regions of objects.

Conclusions:

  • The EPR MOUSE overcomes limitations of traditional EPR by enabling in-situ, non-destructive analysis.
  • Its mobility and versatility open new avenues for EPR spectroscopy applications.
  • Facilitates the study of previously inaccessible samples.