ab initio description of bonding for transmission electron microscopy

Area of Science:

• Materials Science
• Structural Biology
• Computational Physics

Background:

• Electron microscopy simulations are crucial for interpreting images and diffraction patterns.
• The independent atom model is widely used but neglects valence bonding effects.
• Advanced techniques demand more accurate scattering potential descriptions.

Purpose of the Study:

• To review the motivation and basis for ab initio electron scattering simulations.
• To survey existing work on first-principles scattering potentials.
• To provide an outlook on the future of these simulations.

Main Methods:

• Utilizing electrostatic potentials from first-principles calculations (e.g., density functional theory).
• Developing and applying atomistic models for electron scattering.
• Comparing ab initio methods with the independent atom model.

Main Results:

• Ab initio scattering potentials provide a physically better justified description.
• Neglecting valence bonding limits accuracy in advanced electron microscopy.
• First-principles methods are becoming increasingly viable and important.

Conclusions:

• Electron scattering simulations based on ab initio potentials are essential for modern electron microscopy.
• These methods enhance the extraction of information in techniques like 4D-STEM and cryo-EM.
• The trend towards ab initio simulations will continue to grow in importance.