A quadrupole mass filter with flat electrodes

Pearce, CG; Halsall, David

doi:10.1016/0020-7381(78)80099-0

Cited by 12 publications

(8 citation statements)

References 3 publications

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“…A more extreme case is that of a QMS built with flat plate electrodes, for example, the one described by Pearce and Halsall 26. A comparison of our prediction of behaviour with a digitised version of their results for air with water vapour present is shown in Fig.…”

Section: Application Of 2d Field Results To Predict Qms Filter Behaviourmentioning

confidence: 94%

Modelling mass analyzer performance with fields determined using the boundary element method

2010

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Computer modelling is widely used in the design of mass analysers to evaluate proposed designs and determine the effects of manufacturing imperfections. For quadrupole mass filters and ion traps, the models require accurate values of the electric field throughout the regions of the analyser in which ions travel. Most published results using models to predict mass analyser behaviour use electric fields computed with finite element (FE) or finite difference (FD) method. However, the boundary element method (BEM) is capable of achieving the same, or higher, accuracy with both computation times and memory requirements that are at least an order of magnitude less than those required by FE and FD methods. In this paper, electric field evaluation is performed using the BEM formulated in a manner described by previous workers; modifications to their method are described, which lead to higher accuracy field values. Simultaneous equation solution techniques are incorporated, which avoid solutions that are physically not realistic. The performance of linear quadrupole mass spectrometers with hyperbolic, circular and planar section electrodes has been determined using fields computed using these methods and compared with previous results obtained by alternative field computation techniques and with experiment. Behaviour of an ion trap mass spectrometer with circular symmetry has also been investigated. The results demonstrate that in each case using the BEM to determine the fields produces the observed behaviour.

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Section: Application Of 2d Field Results To Predict Qms Filter Behaviourmentioning

confidence: 94%

Modelling mass analyzer performance with fields determined using the boundary element method

2010

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“…Increasing frequency also reduces low mass tail but the effect is minimal. As previously noted, hyperbolic electrodes provide superior performance in resolution and ion transmission for a given number of rf cycles than circular or other shaped electrodes e.g., rectangular [17,18]. The simulated performance characteristics of a QMF constructed from hyperbolic electrodes are therefore investigated.…”

Section: Mixturementioning

confidence: 99%

A Quadrupole mass spectrometer for resolution of low mass isotopes

Sreekumar

Hogan

Taylor

et al. 2010

J. Am. Soc. Mass Spectrom.

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The qualitative and quantitative identification of low mass isotopes in the mass range 1-6 u poses certain difficulties when attempting to achieve the required resolution with an instrument suitable for deployment within a process environment. Certain adjacent species present in the process sample (HT and D 2 ) require a resolution greater than 930 to achieve an accurate measurement. We demonstrate here through simulation techniques that this level of performance required is unachievable using commercially available instruments. Using previously reported simulation techniques, this article demonstrates how the required performance for resolving the low mass isotopes can be achieved by a quadrupole mass spectrometer (QMS), which incorporates a quadrupole mass filter (QMF) constructed from hyperbolic electrodes and operated in zone 3 of the Mathieu stability diagram. (J Am Soc Mass Spectrom 2010, 21, 1364 -1370

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“…Hayashi and Sakudo [17] reported on the use of concave electrodes suitable for vacuum deposition and also the optimization of quadrupole electrodes with flat faces [18] to minimize the multipole field distortions. A little later, Pearce and Halsall [19] demonstrated that a quadrupole field accurate to 0.1% in a significant portion of the central region could be achieved with flat electrodes.…”

Section: Introductionmentioning

confidence: 99%

Performance Characteristics of a MEMS Quadrupole Mass Filter With Square Electrodes: Experimental and Simulated Results

Hogan

Taylor

Cheung

et al. 2010

IEEE Trans. Instrum. Meas.

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Size reduction in quadrupole mass spectrometers (QMSs) is an ongoing requirement driven by the needs of space exploration, portable, and covert monitoring applications. Microelectromechanical systems (MEMS) technology provides a method of achieving this size reduction. A quadrupole mass filter (QMF) is one component of a QMS and is suitable for microfabrication. MEMS manufacturing techniques are more suitable to the production of rectilinear electrodes, instead of the more widely used circular electrodes. Present understanding of the performance characteristics of rectilinear electrodes and the dependence of these characteristics on electrode geometry are not well documented. In this paper, we report on the performance characteristics of a square-electrode QMF. Both the predicted performances obtained by computer simulation and experimental data are presented for operation in stability zone 1 (0.236, 0.706) and zone 3 (3.16, 3.23). A comparison between these results and the simulated data for equivalent devices constructed using hyperbolic and circular electrodes for operation in zone 1 is also made. This comparison demonstrates that, although the field produced by square electrodes is far from the "ideal," it is still possible to achieve useful filtering action. Our results also show that, for operation in zone 3, performance comparable with that of hyperbolic and circular electrodes operating in zone 1 is achievable.

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A quadrupole mass filter with flat electrodes

Cited by 12 publications

References 3 publications

Modelling mass analyzer performance with fields determined using the boundary element method

Modelling mass analyzer performance with fields determined using the boundary element method

A Quadrupole mass spectrometer for resolution of low mass isotopes

Performance Characteristics of a MEMS Quadrupole Mass Filter With Square Electrodes: Experimental and Simulated Results

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