The Electron Ronchigram

Abstract

The electron Ronchigram is a form of inline hologram that offers a convenient way to directly see and measure electron optical aberrations. Any user of an aberration-corrected STEM is likely to benefit from a basic understanding of how such an image is formed and used. This chapter will review the formation of the electron Ronchigram with a particular emphasis on the effects and measurement of aberrations. This review will be largely based on our own approach and previously published work.