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Why Pressure Scales Cause So Much Confusion

Published online by Cambridge University Press:  14 March 2018

Anthony D. Buonaquisti
Anthony D. Buonaquisti*
Affiliation:
University of South Florida

Extract

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Pressure scales can be extremely confusing to new operators. This is not surprising. To my mind, there are three primary areas of confusion.

Firstly, the pressure of gas inside an instrument changes over many orders of magnitude during pump-down. The change is about 9 orders of magnitude for a traditional Scanning Electron Microscope and about 13 orders of magnitude for an ultra-high vacuum instrument such as a Scanning Auger Microprobe.

Type
Research Article
Information
Microscopy Today , Volume 9 , Issue 1 , January 2001 , pp. 26 - 27
Copyright
Copyright © Microscopy Society of America 2001