title: Brief history of the Cambridge STEM aberration correction project and its progeny.
abstract: We provide a brief history of the project to correct the spherical aberration of the scanning transmission electron microscope (STEM) that started in Cambridge (UK) and continued in Kirkland (WA, USA), Yorktown Heights (NY, USA), and other places. We describe the project in the full context of other aberration correction research and related work, partly in response to the incomplete context presented in the paper "In quest of perfection in electron optics: A biographical sketch of Harald Rose on the occasion of his 80th birthday", recently published in Ultramicroscopy.
authors.affiliation: Cavendish Laboratory, University of Cambridge, J.J. Thomson Avenue, Cambridge CB3 0HE, UK.
authors.forename: L Michael
authors.initials: LM
authors.lastname: Brown
authors.affiliation: Institute for Advanced Materials, Devices and Nanotechnology, Rutgers University, Piscataway, NJ 08854, USA; Department of Physics, Rutgers University, Piscataway, NJ 08854, USA; Department of Materials Science, Rutgers University, Piscataway, NJ 08854, USA.
authors.forename: Philip E
authors.initials: PE
authors.lastname: Batson
authors.affiliation: Nion Company, 11515 NE 118th Street, Kirkland, WA 98034, USA.
authors.forename: Niklas
authors.initials: N
authors.lastname: Dellby
authors.affiliation: Nion Company, 11515 NE 118th Street, Kirkland, WA 98034, USA; Department of Physics, Arizona State University, Tempe, AZ 85287, USA.
authors.forename: Ondrej L
authors.initials: OL
authors.lastname: Krivanek
keywords: Aberration correction; Spatial resolution; scanning transmission electron microscope (STEM)