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Related Concept Videos

Cryo-electron Microscopy01:28

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Conventional electron microscopy (EM) involves dehydration, fixation, and staining of biological samples, which distorts the native state of biological molecules and results in several artifacts. Also, the high-energy electron beam damages the sample and makes it difficult to obtain high-resolution images. These issues can be addressed using cryo-EM, which uses frozen samples and gentler electron beams. The technique was developed by Jacques Dubochet, Joachim Frank, and Richard Henderson, for...
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To be visualized by an electron microscope, either transmission or scanning, biological samples need to be fixed (stabilized) so the electron beam does not destroy them and dried thoroughly (desiccated/dehydrated) so the vacuum does not affect them. Fixation needs to be done as quickly as possible because the sample properties will start changing as soon as it is removed from its natural environment. For example, in a tissue sample, the oxygen levels begin decreasing, causing an altered...
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Cryo-electron Microscopy Specimen Preparation By Means Of a Focused Ion Beam
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Calibrating cryogenic temperature of TEM specimens using EELS.

Abinash Kumar1, Elizaveta Tiukalova1, Kartik Venkatraman1

  • 1Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37830, USA.

Ultramicroscopy
|July 21, 2024
PubMed
Summary
This summary is machine-generated.

Precise temperature calibration for cryogenic electron microscopy is essential for studying materials at low temperatures. This study introduces a straightforward electron energy loss spectroscopy method using aluminum plasmons to accurately measure local specimen temperatures.

Keywords:
Cryogenic electron microscopyElectron energy loss spectroscopyLocal temperature determinationVolume plasmon shift

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Area of Science:

  • Materials Science
  • Physics
  • Analytical Chemistry

Background:

  • Cryogenic Scanning/Transmission Electron Microscopy (Cryo-STEM/TEM) is vital for imaging sensitive biological samples and studying materials at low temperatures.
  • Accurate local temperature calibration is critical for understanding phase transitions and emergent properties in quantum materials, but remains a challenge.
  • Existing methods may lack precision or versatility across different experimental setups.

Purpose of the Study:

  • To develop and demonstrate a robust method for precise local temperature calibration of cryogenically-cooled specimens in electron microscopy.
  • To address the challenge of accurate temperature measurement at low temperatures, crucial for materials science research.
  • To validate the method's applicability across various electron microscopes and cooling holders.

Main Methods:

  • Utilized electron energy loss spectroscopy (EELS) to measure local specimen temperatures.
  • Analyzed the temperature-dependent shift of aluminum's bulk plasmon peak in EEL spectra, correlating shifts with thermal expansion/contraction.
  • Applied the method to calibrate different liquid nitrogen cooling holders in both monochromated and non-monochromated electron beam microscopes.

Main Results:

  • Successfully demonstrated a straightforward and versatile EELS-based temperature calibration method.
  • Identified temperature discrepancies between setpoint and actual specimen temperatures ranging from room temperature down to 100 K.
  • Validated the method's effectiveness across diverse cryogenic holders and electron microscopy configurations.

Conclusions:

  • The developed EELS method provides a robust and straightforward approach for accurate local temperature calibration of cryogenically-cooled specimens.
  • Accurate temperature calibration, especially at intermediate cryogenic temperatures, is crucial for reliable materials characterization.
  • This technique enhances the precision and reliability of low-temperature studies in electron microscopy.