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Overview of S(T)EM electron detectors with garnet scintillators: Some potentials and limits
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SYSNO ASEP 0544784 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Overview of S(T)EM electron detectors with garnet scintillators: Some potentials and limits Author(s) Schauer, Petr (UPT-D) RID, SAI, ORCID
Lalinský, Ondřej (UPT-D) RID, ORCID, SAI
Kučera, M. (CZ)Number of authors 3 Source Title Microscopy Research and Technique - ISSN 1059-910X
Roč. 84, č. 4 (2021), s. 753-770Number of pages 18 s. Publication form Print - P Language eng - English Country US - United States Keywords cathodoluminescence ; conductive coating ; garnet film scintillator ; light guide ; SEM electron detector Subject RIV JA - Electronics ; Optoelectronics, Electrical Engineering OECD category Electrical and electronic engineering R&D Projects FV30271 GA MPO - Ministry of Industry and Trade (MPO) LO1212 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) ED0017/01/01 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Open access Institutional support UPT-D - RVO:68081731 UT WOS 000583346100001 EID SCOPUS 85096796587 DOI 10.1002/jemt.23634 Annotation The paper is focused on a complete configuration and design of a scintillation electron detector in scanning electron and/or scanning transmission electron microscopes (S(T)EM) with garnet scintillators. All processes related to the scintillator and light guide were analyzed. In more detail, excitation electron trajectories and absorbed energy distributions, efficiencies and kinetics of scintillators, as well as the influence of their anti-charging coatings and their substrates, assigned optical properties, and light guide efficiencies of different configurations were presented and discussed. The results indicate problems with low-energy detection below 1 keV when the scandium conductive coating with a thickness of only 3 nm must be used to allow electron penetration without significant losses. It was shown that the short rise and decay time and low afterglow of LuGdGaAG:Ce liquid-phase epitaxy garnet film scintillators guarantee a strong modulation transfer function of the entire imaging system resulting in a contrast transfer ability up to 0.6 lp/pixel. Small film scintillator thicknesses were found to be an advantage due to the low signal self-absorption. The optical absorption coefficients, refractive indices, and the mirror optical reflectance of materials involved in the light transport to the photomultiplier tube photocathode were investigated. The computer-optimized design SCIUNI application was used to configure the optimized light guide system. It was shown that nonoptimized edge-guided systems possess very poor light guiding efficiency as low as 1%, while even very complex optimized ones can achieve more than 20%. Workplace Institute of Scientific Instruments Contact Martina Šillerová, sillerova@ISIBrno.Cz, Tel.: 541 514 178 Year of Publishing 2022 Electronic address https://analyticalsciencejournals.onlinelibrary.wiley.com/doi/10.1002/jemt.23634
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