Brief description
Charge contrast images (CCI) of a polished gibbsite grain showing "normal" contrast and "reverse" contrast. The difference in contrast is a result of a 0.1 torr change in pressure from 0.6 torr (normal CCI) to 0.5 torr (reverse CCI). Images were collected using a GSED biased at 400V in an envirnmental scanning ellectron microscope. Subjects
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