Abstract
It has been generally assumed that, in a transmission electron microscope, there exists some combination of lens excitations that will yield almost parallel illumination over a large area of the sample. This assumption is incorrect, when the objective is an immersion lens, due to the beam rotation in the magnetic field. The lack of parallelism is outside the control of the operator and is proportional to the diameter of the illuminated area. It has been measured, in a typical case, as 0.4 mrad/μm, a value that agrees well with calculation. This effect is large and needs to be taken into account when using techniques where parallel illumination is desired.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
