Piecewise Potential Prediction of Electron Phase Contrast

This exercise prompts calculation of the exit surface deBroglie phase shift created in a high energy electron plane wave, as it interacts with the projected potential along the beam direction in solid specimen. Although electron intensity is not affected by the specimen as the beam traverses it in the thin-specimen or ``phase-object'' approximation, an elegant trick of electron optics takes advantage of interference between phase-modified exiting wavefronts downstream in the wavepath. As a result, with sufficiently good beam stability and aberration correction, this can result in an electron intensity map of relative exit surface deBroglie phase (hence of projected potential in the specimen) with sub-atomic lateral resolution.

phasemaps draft PDF

BiBTeX reference:

@article{phasemaps,
author = "P. Fraundorf",
title = "HREM deBroglie phase maps, ala Schrodinger",
journal = "",
volume = "",
number = "",
pages = "",
year = "",
eprint = ""}