Abstract
AbstractRecently, the reliability of field‐emission electron guns has increased. In addition, the cost of computer systems for on‐line processing has dropped. Hence, we should now consider the use of scanning transmission electron microscopy (STEM) for routine work, especially, in the field of biology where one may expect to utilize digital image processing techniques.An STEM has been constructed, without disturbing the original functions, by converting a commercial scanning electron microscope equipped with a fieldemission gun. The STEM is generally operated at accelerating voltage 30 kV, focal length 7.5 mm, and beam current 1−2 × 10−10 A. Several improvements have been incorporated for removing the effects of vibration, contamination, and stray magnetic fields. Also, an adjustable detector aperture was utilized. The modified instrument was connected to an on‐line digital image processing system for utilizing the information obtained from STEM images. The advantages of the modified system were studied from various viewpoints.
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