APPLICATIONS OF A POSTCOLUMN IMAGING FILTER IN BIOLOGY AND MATERIALS SCIENCE

We have developed an energy-selecting imaging filter which can be atta ched to most transmission electron microscopes, and is capable of oper ating at primary energies of up to 400 keV. We review the filter's des ign and operation, and illustrate them with several applications inclu ding imaging of thick biological materials, energy-filtered diffractio n, energy-filtered high-resolution imaging, and elemental mapping. We conclude the paper with a discussion of the areas of transmission elec tron microscopy in which the filter is likely to make especially signi ficant contributions.