VPSEMVariable Pressure Scanning Electron Microscopy
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The morphology of VPSEM image and quantitative EDX analysis of carbon steel immersed in absence and presence of C-SRB are shown in Figures 4 and 5.
For the VPSEM pressure range (10 Pa and 100 Pa) x-ray absorption by the gas phase is not a significant effect, being only about 6 % for F K x rays, which are strongly absorbed by oxygen.
What is the influence of the skirt on electron imaging and x-ray spectrometry performed in the VPSEM and ESEM?
In the VPSEM, the inelastic scattering of beam and backscattered electrons with gas atoms creates free electrons and positive ions.
Operation in the VPSEM pressure range or the low portion of the ESEM pressure range should effectively eliminate both of these artifacts.
The S-3400N VPSEM is the first instrument to fully automate the alignment of the five position objective aperture with a "no touch" one button keystroke.