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Scan system for the subangstrom STEM

A computer-controlled scan system has been completed for a sub-angstrom resolution STEM (scanning transmission electron microscope). Controlled by a PC-AT, this system is able to control beam scan, unscan, alignment, and correction of aberration. Using this system, the raster size, shape, rotation angle, and raster position may be controlled by subroutines for image generation/transformation. Computer control allows the simultaneous setting of multiple parameters allowing easy operation of the microscope and saving experimenter time.