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Charge accumulation in electron cryomicroscopy.

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Summary
This summary is machine-generated.

Electron beam irradiation of ice specimens causes dynamic charge buildup, creating unexpected negative charges. These charges act as sensitive detectors, revealing new insights into charge dynamics during electron cryomicroscopy (cryoEM).

Keywords:
ChargingCryoEMLow-dose electron microscopySingle-particle reconstructionStructure determination

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Area of Science:

  • Materials Science
  • Biophysics
  • Electron Microscopy

Background:

  • Electron irradiation of amorphous water ice in transmission electron microscopes induces static charge accumulation.
  • This dynamic charge can deflect electrons, blurring micrographs and complicating low-dose electron cryomicroscopy (cryoEM).
  • Previous work identified positive charge accumulation in irradiated areas.

Purpose of the Study:

  • To provide a physical description of charge accumulation in ice specimens during electron irradiation.
  • To characterize the dynamic behavior of this charge in the context of low-dose cryoEM.
  • To measure the magnitude and dynamics of charge accumulation and neutralization.

Main Methods:

  • Irradiation of plunge-frozen amorphous water ice specimens in a transmission electron microscope.
  • Observation of charge accumulation and its effects on transmitted electrons.
  • Utilizing micrometer-sized specimen holes in carbon support foil as electrostatic lenses to detect negative charge buildup.

Main Results:

  • Confirmed positive charge accumulation in primary irradiation areas.
  • Discovered unexpected negative charge buildup in nearby unirradiated regions.
  • Observed that specimen holes act as diverging electrostatic micro-lenses, enabling sensitive charge detection.
  • Found that charge accumulation saturates at a dynamic equilibrium at a significantly lower electron fluence than typically used for cryoEM.

Conclusions:

  • The study reveals a novel mechanism of negative charge accumulation and its role in cryoEM.
  • The observed micro-lenses provide a new method for directly measuring charge dynamics.
  • Findings will inform the development of optimal imaging conditions and contribute to a comprehensive theory of information loss in cryoEM.