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Momentum dispersion and mass resolution of magnetic sector instruments for surface analysis
Author(s) -
Oechsner Hans
Publication year - 2019
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.6635
Subject(s) - momentum (technical analysis) , magnetic field , physics , dispersion (optics) , homogeneous , resolution (logic) , momentum transfer , computational physics , chemistry , atomic physics , optics , statistical physics , quantum mechanics , computer science , finance , artificial intelligence , economics , scattering
The momentum‐dependent dispersion of ion trajectories in a homogeneous magnetic sector field is derived by a trigonometric method. Contrary to the often used transfer matrix technique, the results are not restricted to small momentum differences. Based on the results of the trigonometric evaluation, an expression for the mass resolution of a magnetic sector for an entering ion beam is derived and extensively discussed. An example for high‐resolution magnetic mass spectrometry is presented.