A new electron energy analyser for voltage measurement in the SEM

A. Gopinath, W. J. Tee

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


An earlier system for voltage measurement in the scanning electron microscope (SEM) used a hemispherical retarding field analyser comprising two grids and a solid outer collector. A new electron energy analyser is described which uses two extra grids in place in the solid hemisphere, and thus allows high-energy backscattered primary electrons to escape from the analyser. This modification enables an image of the specimen to be easily obtained and, in conjunction with a modified feedback control loop, reduces the magnitude of the unwanted topographic and compositional contrast signals. The performance of the voltage measurement system using this 'four-grid' analyser is discussed and compared with that obtained from the solid hemisphere analyser.

Original languageEnglish (US)
Article number024
Pages (from-to)660-663
Number of pages4
JournalJournal of Physics E: Scientific Instruments
Issue number6
StatePublished - Dec 1 1977


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