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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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Low energy electron microscopy at cryogenic temperatures.

Arash Tebyani1, Sebastian Schramm1, Marcel Hesselberth1

  • 1Huygens-Kamerlingh Onnes Laboratorium, Leiden Institute of Physics, Leiden University, Niels Bohrweg 2, P.O. Box 9504, RA Leiden NL-2300, Netherlands.

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Summary

A new cryogenic sample chamber for low-energy electron microscopy (LEEM) allows temperatures as low as 15 K. This significantly reduces electron beam damage in materials like pentacene films, enabling clearer low-temperature LEEM studies.

Keywords:
Cryogenic microscopyIrradiation damageLEEMPentacene

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Area of Science:

  • Materials Science
  • Surface Science
  • Physics

Background:

  • Low-energy electron microscopy (LEEM) is a powerful surface analysis technique.
  • Electron beam irradiation can cause damage to delicate samples, limiting analysis.
  • Achieving cryogenic temperatures is crucial for studying certain material properties and phenomena.

Purpose of the Study:

  • To develop and implement a cryogenic sample chamber for an aberration-corrected LEEM instrument.
  • To investigate the effect of low temperatures on electron beam irradiation damage.
  • To explore changes in material properties at cryogenic temperatures using LEEM.

Main Methods:

  • Modification of an existing aberration-corrected LEEM instrument.
  • Integration of sample cooling mechanisms using liquid nitrogen and liquid helium.
  • Experimental characterization of a three-monolayer pentacene film at various temperatures.

Main Results:

  • Achieved sample temperatures down to approximately 15 K.
  • Observed a >5-fold reduction in 15 eV electron beam irradiation damage cross-section for pentacene films when cooled from 300 K to 52 K.
  • Detected alterations in LEEM-IV spectra of the pentacene film upon cooling.

Conclusions:

  • The developed cryogenic LEEM system effectively reduces electron beam damage at low temperatures.
  • Low-temperature LEEM provides new insights into material behavior and stability.
  • Further investigation is warranted to understand the observed changes in LEEM-IV spectra.