Linear ion trap with added octopole field component: the property and method

Dang, Qiankun; Xu, Fuxing; Huang, Xiaohua; Fang, Xiang; Wang, Rizhi; Ding, Chuan‐Fan

doi:10.1002/jms.3714

Cited by 12 publications

(6 citation statements)

References 41 publications

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“…An ion trap using a hyperboloid electrode can generate an ideal quadrupolar field, and modifications to the electrode structure will introduce other multipolar field components. Previous studies have found that high‐order field components are one of the key factors affecting the performance of ion trap resolution and collision efficiency 27–29 . Further analysis of the multipolar component of the electric field in the trap is performed, and the results are shown in Table 2.…”

Section: Resultsmentioning

confidence: 99%

Asymmetric rectilinear ion trap with unidirectional ion ejection capability

et al. 2020

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In this paper, the shapes of the electrodes are modified based on a rectilinear ion trap to achieve unidirectional ejection of ions. The designed asymmetric rectilinear ion trap (ARIT) analyzer adds convex and concave circular structures with a height of 0.5 mm on the two X-electrodes, so that the electric field center of the ion trap is inclined to the concave side. The electric field lines of the convex side are compressed to the concave side. Both simulations and experimental results show that ions are more likely to emit from the slit on the concave side plate when performing ion resonance ejection. The mass spectrum signal intensity can reach more than twice that of the original rectilinear trap when using only one detector. Calculations of the electric field components in the trap show that the even-order higher field proportion in the ion trap has not been significantly affected. Combined with the experimental test results, the study further confirmed that the developed ARIT has no significant loss in mass resolution, tandem mass spectrometry capability, and quantitative analysis capability. The proposed asymmetric structure modification scheme can achieve single-side ejection without significantly affecting other performances of the analyzer, which provides a new idea for the structural optimization of the subsequent ion trap analyzers.

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Section: Resultsmentioning

confidence: 99%

Asymmetric rectilinear ion trap with unidirectional ion ejection capability

et al. 2020

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“…Note that traps with both axial and radial symmetry generally only contain even-order fields in which ion secular frequencies will increase with the radial distance for a positive field contribution [85,86]. The corresponding effect on mass spectral performance with resonance ejection is that, for traps with positive even-order fields, resolution is increased when scanning the rf amplitude from low to high, but decreased when scanning from high to low, as shown in Figure 4b [87][88][89]. This is because as ions are brought to the resonance ejection working point, they increase their amplitudes in the trap.…”

Section: Effect Of Higher-order Fields On Mass Analysismentioning

confidence: 99%

Resonance methods in quadrupole ion traps

Snyder

Peng

Cooks

2017

Chemical Physics Letters

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The quadrupole ion trap is widely used in the chemical physics community for making measurements on dynamical systems, both intramolecular (e.g. ion fragmentation reactions) and intermolecular (e.g. ion/molecule reactions). In this review, we discuss linear and nonlinear resonances in quadrupole ion traps, an understanding of which is critical for operation of these devices and interpretation of the data which they provide. The effect of quadrupole field nonlinearity is addressed, with important implications for promoting fragmentation and achieving unique methods of mass scanning. Methods that depend on ion resonances (i.e. matching an external perturbation with an ion's induced frequency of motion) are discussed, including ion isolation, ion activation, and ion ejection.

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“…21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 …”

Section: Notesunclassified

“…This has been implemented in SIMION, [11][12][13] ITSIM, [13][14][15][16] ISIS, 13,17 and some other home written simulation programs. [18][19][20][21] Our recent study, however, has shown that the flowing motion of the gas molecules at pressures as low as 10 -5 Torr could have a significant impact on the trapping of the ions. 22 At pressures of 1 Torr and higher, collisions occur more frequently.…”

Section: Introductionmentioning

confidence: 98%

“…The ion trajectory is typically treated with a free motion in electric field subsequently modified by stochastic Monte Carlo collisions, typically used for static molecular flow model. This has been implemented in SIMION, − ITSIM, − ISIS, , and some other home written simulation programs. − Our recent study, however, has shown that the flowing motion of the gas molecules at pressures as low as 10 –5 Torr could have a significant impact on the trapping of the ions …”

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confidence: 99%

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Following the Ions through a Mass Spectrometer with Atmospheric Pressure Interface: Simulation of Complete Ion Trajectories from Ion Source to Mass Analyzer

Zhou

Ouyang

2016

Anal. Chem.

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Ion trajectory simulation is an important and useful tool in instrumentation development for mass spectrometry. Accurate simulation of the ion motion through the mass spectrometer with atmospheric pressure ionization source has been extremely challenging, due to the complexity in gas hydrodynamic flow field across a wide pressure range as well as the computational burden. In this study, we developed a method of generating the gas flow field for an entire mass spectrometer with an atmospheric pressure interface. In combination with the electric force, for the first time simulation of ion trajectories from an atmospheric pressure ion source to a mass analyzer in vacuum has been enabled. A stage-by-stage ion repopulation method has also been implemented for the simulation, which helped to avoid an intolerable computational burden for simulations at high pressure regions while it allowed statistically meaningful results obtained for the mass analyzer. It has been demonstrated to be suitable to identify a joint point for combining the high and low pressure fields solved individually. Experimental characterization has also been done to validate the new method for simulation. Good agreement was obtained between simulated and experimental results for ion transfer though an atmospheric pressure interface with a curtain gas.

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Linear ion trap with added octopole field component: the property and method

Cited by 12 publications

References 41 publications

Asymmetric rectilinear ion trap with unidirectional ion ejection capability

Asymmetric rectilinear ion trap with unidirectional ion ejection capability

Resonance methods in quadrupole ion traps

Following the Ions through a Mass Spectrometer with Atmospheric Pressure Interface: Simulation of Complete Ion Trajectories from Ion Source to Mass Analyzer

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