Simulating realistic imaging conditions for in situ liquid microscopy.

Area of Science:

• Materials Science
• Biophysics
• Microscopy

Background:

• In situ transmission electron microscopy (TEM) allows imaging of samples in near-native states.
• Interpreting contrast features and optimizing imaging conditions in TEM remain challenging.

Purpose of the Study:

• To develop a virtual technique for simulating fluid-stage high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM).
• To improve the interpretation of image contrast and predict optimal imaging parameters for fluid-stage systems.

Main Methods:

• A multislice method was employed to create a virtual imaging technique.
• The technique simulates fluid-stage systems composed of millions of atoms.
• Simulations were performed for lead sulfide (PbS) nanoparticles under various imaging conditions.

Main Results:

• The virtual technique successfully simulated images of PbS nanoparticles.
• Simulation results showed good agreement with previous experimental findings.
• The study provides insights into how fluid path length, membrane thickness, nanoparticle position, and defocus affect image quality.

Conclusions:

• The developed virtual HAADF-STEM technique enables the simulation of complex fluid-stage systems.
• This computational approach aids in understanding and optimizing in situ TEM imaging.
• The findings contribute to improved image interpretation and prediction of imaging parameters for nanoscale systems.