Computer simulations of hexapole aberration correctors
نویسندگان
چکیده
منابع مشابه
Current and future aberration correctors for the improvement of resolution in electron microscopy.
The achievable resolution of a modern transmission electron microscope (TEM) is mainly limited by the inherent aberrations of the objective lens. Hence, one major goal over the past decade has been the development of aberration correctors to compensate the spherical aberration. Such a correction system is now available and it is possible to improve the resolution with this corrector. When high ...
متن کاملAberration corrected TEM: current status and future prospects
Aberration correction leads to a substantial improvement in the interpretable resolution of Transmission Electron Microscopes. Electron optical correctors based on two strong hexapole elements linked through a round lens transfer doublet enables direct correction of all axial aberrations to third order. Subsequent, indirect computational analysis of a focal or tilt series of images offers the p...
متن کاملRequirements for discrete actuator and segmented wavefront correctors for aberration compensation in two large populations of human eyes.
Numerous types of wavefront correctors have been employed in adaptive optics (AO) systems for correcting the ocular wavefront aberration. While all have improved image quality, none have yielded diffraction-limited imaging for large pupils (>/=6 mm), where the aberrations are most severe and the benefit of AO the greatest. To this end, we modeled the performance of discrete actuator, segmented ...
متن کاملBenefits and Possibilities of Cc–Correction for TEM / STEM
During the last decade aberration correction became possible for several types of electron optical instruments. Correctors for the spherical aberration of TEM / STEM objective lenses are now commercially available [1,2]. In case of the SEM [3] and the LEEM / PEEM [4] the correction of both the spherical and the chromatic aberration has been demonstrated in experiments. In spite of these great a...
متن کاملComputer simulations as experiments
Whereas computer simulations involve no direct physical interaction between the machine they are run on and the physical systems they are used to investigate, they are often used as experiments and yield data about these systems. It is commonly argued that they do so because they are implemented on physical machines. We claim that physicality is not necessary for their representational and pred...
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ژورنال
عنوان ژورنال: Physics Procedia
سال: 2008
ISSN: 1875-3892
DOI: 10.1016/j.phpro.2008.07.095