More efficient channel electron multiplier by coating of the cone with a high secondary electron yield material

The efficiency of channel electron multipliers (CEM) falls drastically at energies of the incident electrons greater than a few KeV. For conversion Electron Mössbauer Spectroscopy (CEMS) the conversion electron energies are far greater than a few KeV, and the CEM efficiency at 7 KeV, for example, is...

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Bibliographic Details
Published in:Review of scientific instruments 1981-10, Vol.52 (10), p.1490-1492
Main Authors: Manalio, A. A., Burin, K., Rothberg, G. M.
Format: Article
Language:English
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Summary:The efficiency of channel electron multipliers (CEM) falls drastically at energies of the incident electrons greater than a few KeV. For conversion Electron Mössbauer Spectroscopy (CEMS) the conversion electron energies are far greater than a few KeV, and the CEM efficiency at 7 KeV, for example, is about 10% determined in our laboratory. The efficiency can be improved by increasing the secondary electron yield of the detector cone. To find a coating material, a study of relative secondary electron yields was carried out using a scanning microscope. The results of the study indicate that the detector efficiency should improve by more than a factor of 3 when the cone is coated with MgO. Experimentally, the efficiency of the coated detector is in fact more than 3 times that of the uncoated detector.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.1136481