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Imaging properties of electrostatic energy analyzers with toroidal fields
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
1976 (English)In: Journal of Electron Spectroscopy and Related Phenomena, ISSN 0368-2048, E-ISSN 1873-2526, Vol. 9, 111-27 p.Article in journal (Refereed) Published
Abstract [en]

Numerical values of the second-order aberration coefficients are given for two classes of toroidal fields, namely (1) the ‘quasi-spherical’ field with <i>c</i>=1, <i>c</i>’&ne;-1, and (2) fields with <i>c</i> in the region 1.6-1.8. For the ‘quasi-spherical’ fields, the second-order coefficients are given as functions of the deflection angles &omega; for 90&deg;&les;&omega;&les;180&deg;. The third-order coefficient for the spherical field are given in the same region. For the devices in the second class, which have one intermediary axial image, the second-order coefficients are studied as functions of <i>c</i> and &omega;, subject to the conditions that double-focusing should be obtained. The conditions under which the radial and axial image planes coincide are considered. The influence of axially curved entrance and exit surfaces is investigated. One special case (&omega;=180&deg;, <i>c</i>=1.691, <i>c</i>’=-1.11), which may be favourable for an electron monochromator is discussed

Place, publisher, year, edition, pages
1976. Vol. 9, 111-27 p.
Keyword [en]
aberrations;electron spectroscopy;electrostatic lenses;focusing;spectrometer components and accessories;
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-72373OAI: oai:DiVA.org:kth-72373DiVA: diva2:487533
Note
electrostatic energy analyzers;toroidal fields;axial image planes;electron monochromator;imaging properties;second order aberration coefficients;quasispherical field;double focusing;radial image plane;electron optics; NR 20140805Available from: 2012-01-31 Created: 2012-01-31 Last updated: 2017-12-08Bibliographically approved

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http://dx.doi.org/10.1016/0368-2048(76)81023-7

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