Application of a static magnetic field to the mass filter of a quadrupole mass spectrometer

doi:10.1016/S0042-207X(98)00389-3

Vacuum

Volume 53, Issues 1–2, May 1999, Pages 211-213

https://doi.org/10.1016/S0042-207X(98)00389-3 Get rights and content

Abstract

We consider the case of a generalised quadrupole mass spectrometer in which a static magnetic field is applied to the body of the filter. We have solved numerically the extended Mathieu equation numerically constructing a theoretical transmission mass spectrum. The analysis shows for what values of the parameters an enhancement of the quadrupole resolution is achieved. Initial experimental results for argon confirm the predicted theoretical trends.

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Cited by (9)

Effect of an axial magnetic field on the performance of a quadrupole mass spectrometer
2010, Journal of the American Society for Mass Spectrometry
Citation Excerpt :
It should be noted that ion motion in both the x- and y-directions is affected if the magnetic field is applied in the z-direction. This is in contrast to the case of magnetic field application in the x- direction, where ion motion only in y-direction is affected [20]. The simulated mass peaks for 40Ar+ ions using the computer software are shown in Figure 3.
We consider the case of a quadrupole mass spectrometer (QMS) in which a static magnetic field is applied axially in the z-direction along the length of the mass filter. The theoretical approach assumed in the model is that the QMS contains hyperbolic rods as electrodes and that the magnetic field acts over the full length of the mass filter assembly. Initial experimental results with argon and helium for a low-resolution instrument confirm the predicted theoretical trends. The analysis also predicts for which values of operating parameters an enhancement of the instrument resolution is achieved when an axial magnetic field is applied. The model predicts instrument resolution R >3000 for a QMS with a 200 mm long mass filter via application of an axial magnetic field.
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