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Published on: September 14, 2018
An experimental model of beam broadening in the variable pressure scanning electron microscope
1Electron Microscope Facility, University of Tennessee, Knoxville 37996-0840, USA.
Abstract:
In the variable pressure scanning electron microscope (VP-SEM) the incident electrons pass through a gaseous environment and the beam is scattered by these interactions. We show here that the experimental intensity profile of the scattered beam can be described as Gaussian in form to a high level of accuracy. This provides a rapid means of accounting for the effects of beam scatter in imaging and microanalysis because the standard deviation of the Gaussian is a simple function of parameters such as working distance, beam energy, gas type and pressure.
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