2018Koeck PhaseShift
Citation
Koeck, P. J. B. Design of an electrostatic phase shifting device for biological transmission electron microscopy. Ultramicroscopy, 2018, 187, 107-112
Abstract
I suggest an electrostatic phase plate designed to broaden the contrast transfer function of a transmission electron microscope operated close to Scherzer defocus primarily in the low resolution direction. At higher defocus the low frequency behavior is equal to that close to Scherzer defocus, but CTF-correction becomes necessary to extend image interpretation to higher resolution. One simple realization of the phase plate consists of two ring shaped electrodes symmetrically surrounding the central beam. Since no physical components come into contact with the central beam and charge on the electrodes is controlled by an external voltage supply, problems with uncontrolled charging are expected to be reduced.
Keywords
Links
https://www.sciencedirect.com/science/article/pii/S030439911730270X