Field imperfection induced axial secular frequency shifts in nonlinear ion traps

Sevugarajan, S and Menon, AG (1999) Field imperfection induced axial secular frequency shifts in nonlinear ion traps. In: International Journal of Mass Spectrometry, 189 (1). pp. 53-61.

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Abstract

This article develops a simple analytical expression that relates ion axial secular frequency to field aberration in ion trap mass spectrometers. Hexapole and octopole aberrations have been considered in the present computations. The equation of motion of the ions in a pseudopotential well with these superpositions has the form of a Duffing-like equation and a perturbation method has been used to obtain the expression for ion secular frequency as a function of field imperfections. The expression indicates that the frequency shift is sensitive to the sign of the octopole superposition and insensitive to the sign of the hexapole superposition. Further, for weak multipole superposition of the same magnitude, octopole superposition causes a larger frequency shift in comparison to hexapole superposition.

Item Type:	Journal Article
Publication:	International Journal of Mass Spectrometry
Publisher:	Elsevier.
Additional Information:	Copyright of this article belongs to Elsevier.
Keywords:	Nonlinear traps;Secular frequency;Multipoles;Frequency shift;Duffing equation
Department/Centre:	Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Date Deposited:	21 Jul 2009 10:37
Last Modified:	19 Sep 2010 05:28
URI:	http://eprints.iisc.ac.in/id/eprint/19510

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