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A scanning electron microscope (SEM) is employed to study the charging phenomenon of polymethylmethacrylate using the mirror image method. Classical scattering theory is modified to calculate the total trapped charge Q. This theory has also been used to justify the use of a fitting procedure to calculate Q. The fitting procedure is more feasible for a SEM which does not have low accelerating voltage facility. Results from both methods are compared. Details of derivation are given.
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Chen et al. (1994) studied this question.
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