Microfabrication of Cylindrical Ion Trap Mass Spectrometer Arrays for Handheld Chemical Analyzers

Amerom, F. H. W. van; Chaudhary, Anita; Cardenas, Michelle L; Bumgarner, John; Short, R.T.

doi:10.1080/00986440701569176

Cited by 36 publications

(24 citation statements)

References 33 publications

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“…In fact, almost all commercialized miniature mass spectrometers, for example Guardion-7 (Lammert et al, 2006) and Griffin Analytical 600 in Table 1, have adopted ion traps and QMF. In addition, it can be noted that there is a large variety of ion traps: (1) three dimensional hyperbolic ion traps, (2) rectilinear ion traps (Liang et al, 2008;Fico et al, 2009;Li et al, 2009;Ouyang et al, 2009), (3) toroidal ion traps (Lammert et al, 2006), (4) planar electrode ion traps (Austin et al, 2007;Austin et al, 2008;Yang et al, 2008), and (5) cylindrical ion traps (Van Amerom et al, 2008;Wells et al, 2008;Chaudhary et al, 2009). …”

Section: Overview Of Miniaturized Mass Spectrometersmentioning

confidence: 99%

Miniaturized Mass Spectrometer in Analysis of Greenhouse Gases: The Performance and Possibilities

Shimma¹,

Toyoda²

2012

Greenhouse Gases - Emission, Measurement and Management

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Section: Overview Of Miniaturized Mass Spectrometersmentioning

confidence: 99%

Miniaturized Mass Spectrometer in Analysis of Greenhouse Gases: The Performance and Possibilities

Shimma¹,

Toyoda²

2012

Greenhouse Gases - Emission, Measurement and Management

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“…In contrast to TOFs, linear quadrupoles, and magnetic sectors [19], ion traps enjoy the ability to perform tandem mass spectrometry with a single mass analyzer [20]. The simplified geometry of a cylindrical ion trap in comparison to 3D ion traps has led to a significant research investment in the miniaturization of ion traps [21][22][23][24][25][26] and micro-fabricated ion trap arrays [27][28][29]. Lammert [30,31] and Austin [32][33][34] have studied toroidal ion traps of various geometries in an attempt to expand the quantitative dynamic range of ion traps in miniature and portable instruments.…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of a Loeb-Eiber Mass Filter at 1 Torr

Hoffmann

Feng

Pedder³

et al. 2014

J. Am. Soc. Mass Spectrom.

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Abstract. The Loeb-Eiber mass filter is best operated at relatively high pressures-such as 1 Torr-where collisional dampening of ions up to the mass filter thermalizes the ions' kinetic energy, which is a requirement for effective filtering. The inter-electrode gaps of~8 μm require rf amplitudes on the order of 0-5 V p-p at approximately 50 MHz to achieve mass filtering up to m/z 40. Mass filtering between the 25-μm diameter wires, therefore, takes place on time frames less than the collision frequency at~1 Torr. The low power and high pressure capabilities of the Loeb-Eiber mass filter make it ideally suited for miniaturization, where power and space are a premium. In the present work, a Loeb-Eiber mass filter was constructed using commercial silicon-on-insulator (SOI) microfabrication techniques. Ions transmitting through the chip-based Loeb-Eiber mass filter were characterized in real time using a traditional linear quadrupole mass analyzer in series with the Loeb-Eiber mass filter. The new hybrid instrument has enabled us to verify several important claims regarding the operation of the Loeb-Eiber mass filter: (1) that ions can be effectively filtered at~1 Torr, (2) that for ions of a fixed mass-to-charge ratio, the ion transmission current decreases linearly with increasing rf amplitude on the Loeb-Eiber mass filter, (3) that the cutoff voltage at which all ions of a particular m/z value are effectively blocked is linearly related to mass-to-charge, and (4) that square waveforms can filter ions more effectively than sinusoidal waveforms for a given peak-to-peak rf amplitude.

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“…Particular attention has been devoted to cylindrical ion traps (CITs), since these may be easily constructed as planar arrays [22][23][24][25], and several portable systems containing CITs have been demonstrated [26][27][28][29]. More recently, microfabricated ion traps have been demonstrated in cylindrical [30][31][32][33], toroidal [34] and linear [35][36][37] arrangements. Many other mass filter types have been realised in microfabricated form, including magnetic and crossed field filters [38][39][40][41][42][43], time-of-flight filters [44][45][46][47][48] and ion separators based on travelling electric fields [49,50].…”

Section: Introductionmentioning

confidence: 99%

Microfabricated Quadrupole Mass Spectrometer With a Brubaker Prefilter

Wright¹,

O'Prey²,

Syms

et al. 2010

J. Microelectromech. Syst.

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Microfabricated quadrupole mass spectrometers with Brubaker pre-filters are demonstrated for the first time. Complete filters are assembled from two dies, each carrying two pairs of rods providing the pre-filter and main filter sections. The rods are held in precision silicon mounts that are fabricated using wafer scale deep reactive ion etching and anodic bonding to glass substrates. Improvements to ion transmission are obtained by tuning the bias potential applied to the pre-filter. The effect is explained in terms of a simple analytic theory for ion motion in the pre-filter. Mass filtering with a range of m/z = 0-1200 and a resolution of m/Δm ≈ 150 at 10% of peak height is demonstrated using 2-4 mm long pre-filter electrodes, 30 mm long main electrodes (both of 650 µm diameter) and a RF drive at ≈ 6.5 MHz.

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Microfabrication of Cylindrical Ion Trap Mass Spectrometer Arrays for Handheld Chemical Analyzers

Cited by 36 publications

References 33 publications

Miniaturized Mass Spectrometer in Analysis of Greenhouse Gases: The Performance and Possibilities

Miniaturized Mass Spectrometer in Analysis of Greenhouse Gases: The Performance and Possibilities

Performance Evaluation of a Loeb-Eiber Mass Filter at 1 Torr

Microfabricated Quadrupole Mass Spectrometer With a Brubaker Prefilter

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