04canalyzersHO - IVC. Analyzers 22.Nov.97 Topic Outline...

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MTS 723 F97 IVC. Analyzers 22.Nov.97 MTS 723 Topic Outline 1 IVC. Analyzers Introduction Terminology Goals Limitations RFA Retarding Field Operation Principles Pros and Cons CMA Cylindrical Mirror Principles Pros and Cons Advanced CMA Advantages CSA Cylindrical Sector Pros and Cons HSA Hemispherical Sector Principles Pros and Cons Comparisons MTS 723 Terminology 2 Pass Energy E P The energy of the electrons as they pass through the analyzer. Transmission Function T(E) How well the analyzer transmits a given input signal at a given energy. Resolution Absolute Resolution E The energy spread induced by the analyzer as an electron passes through it. Relative Resolution E/E The energy spread at a given energy. MTS 723 Goals 3 The ideal electron analyzer should have an infintesimly small analysis energy window (zero energy spread due to the analyzer) transmission of all electrons from the event in the spatial region of interest (a high transmission function) a transmission function that is independent of pass energy resolution that is independent of pass energy in some cases, spatially focussed analysis at the sample (small spot capabilities) MTS 723 Limitations 4 Electron analyzers use electrostatic or electro- magnetic fields to deflect electrons. Because the fields can only be controlled to finite precision, the entrance and exit slits have finite width, and the field regions between analyzer components have abrupt
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This note was uploaded on 12/15/2011 for the course MTS 723 taught by Professor Staff during the Spring '09 term at University of Alabama - Huntsville.

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04canalyzersHO - IVC. Analyzers 22.Nov.97 Topic Outline...

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