HP Labs Technical Reports
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Analytic Expression for NonLinear Ion Extraction Fields Which Yield Ideal Spatial Focusing in TimeofFlight Mass Spectrometry
Flory, Curt A.; Taber, Robert C.; Yefchak, George E.
HPL9588
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Abstract: One of the factors limiting the achievable mass resolution in timeofflight mass spectrometers is the nonzero extent of the ion spatial distribution along the dimension parallel to the extraction axis. The effects of this spatial distribution are normally minimized by placing the detector at the position along the flight path where the temporal spread of an isomass ion packet is minimized. This position is known as the spacefocus plane. In this paper, an analytic expression is obtained for the nonlinear field in the extraction region which would yield theoretically perfect ion packet focusing at the spacefocus plane. The mathematical techniques required are those commonly used in the solution of calculus of variations problems.
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