Space Charge Aberrations in Single Shot Time-Resolved Transmission Electron Microscopy

TL;DR

This paper analyzes how space charge effects influence image quality in single shot time-resolved TEM, deriving analytical models and validating them with simulations to understand resolution trade-offs.

Contribution

It introduces a Green's function perturbation method to analytically estimate space charge aberrations and their dependence on initial beam conditions in time-resolved TEM.

Findings

Derived analytical estimates for space charge aberrations.

Validated models with particle tracking simulations.

Provided scaling laws for resolution trade-offs.

Abstract

In this paper, we discuss effects of space charge fields on imaging performance in a single shot time-resolved electron microscope (TEM). Using a Green's function perturbation method, we derive analytical estimates for the effects of space charge nonlinearity on the image formation process and the associated aberration coefficients. The dependence of these coefficients on the initial beam phase space distribution is elucidated. The results are validated by particle tracking simulations and provide fundamental scaling laws for the trade-off between temporal and spatial resolution in single-shot time-resolved TEM.