Linear ion trap mass selectivity with impulse power supply and sinusoidal dipolar excitation

Xu, Fuxing; Konenkov, N. V.; Ding, H.J.; Wang, Yuanyuan; Ding, Chuan‐Fan

doi:10.1002/rcm.7721

Cited by 4 publications

(11 citation statements)

References 39 publications

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“…A simulation of the LIT with impulse power supply and sinusoidal DE is presented in detail in. 40 Consider the trapezoidal shape of the quadrupole RF voltage for the Resonant frequency ν −1 = (2 − β) / 2. Dipolar amplitudes q ex = 0.00049971 and q ex = 0.0005069, m = 609 Th, q ejec = 0.85 .…”

Section: Lit With Impulse Power Supplymentioning

confidence: 99%

“…40 The excitation contours for different rod set ratio r / r 0 = 1.125, 1.130, 1.135 and 1.140 for given condition τ = π / 8, q = 0.5, β = 0.4376. 40 efficiency decreases with higher values of q 16,17,19 because the QMF acceptance will decrease with q up to q = 0.908.…”

Section: Lit With Impulse Power Supplymentioning

confidence: 99%

“…A simulation of the LIT with impulse power supply and sinusoidal DE is presented in detail in. 40 Consider the trapezoidal shape of the quadrupole RF voltage for the linear ion trap shown in Figure 9. The impulse shape is described by a single parameter τ.…”

Section: Modeling Linear Ion Trapsmentioning

confidence: 99%

“…(a) The excitation contours at shown wave shapes at working point q = 0.5 and excitation time n = 500 RF cycles, A 2 = 1. (b)The excitation contours for different rod set ratio r / r 0 = 1.125, 1.130, 1.135 and 1.140 for given condition τ = π / 8, q = 0.5, β = 0.4376 40.…”

mentioning

confidence: 99%

“…(a) The solid line is theoretical curve qdβ / dq (equation 1.18) and circle points are results from numerical simulation of the excitation contours. (b) A comparison between theoretical (line) mass resolution and experimental resolution (filled circles) at different values of q for Sin wave 40.…”

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Dipole and quadrupole resonance excitation in linear quadrupoles

Konenkov

2023

Eur J Mass Spectrom (Chichester)

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In the development of commercial quadrupole mass spectrometers, there is an interest in improving the performance characteristics such as transmission, resolution, and mass range. In particular, parametric and dipolar resonance excitation of trapping ions are used for linear quadrupole mass filters. Theoretical methods and numerical simulation of ion trajectories were applied for study of ion-optical properties. The review is devoted to description of different excitation methods to improve QMF performance and consists of three parts. The first part presents the results of a linear ion trap simulation for various operating conditions and excitation methods. The second part considers the effects of dipole excitation (DE) on the performance of the quadrupole mass filter. The last part analyzes the formation of stability islands by different methods of quadrupole excitation. To date conditions of mass separation in quadrupole mass filters with sin wave supply were described for stability islands of the first and third stability regions formed by quadrupole and DE. By complicating the electronics such methods allow to overcome the destructive influence of electric field distortions and obtain a resolving power and ion transmission efficiency comparable with commercial devices. At quadrupole resonance excitation by a two-frequency signal, it is possible to reduce the length of electrodes three times without losses in resolution and transmission, which reduces the cost of rod set production with micrometer accuracy. Dipole resonance excitation allows controlling the shape of the mass peak by changing amplitude and phase of the auxiliary AC signal. The main factors affecting the resolving power of a linear ion trap are described theoretically. The numerical modeling results are confirmed by experiment.

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Section: Lit With Impulse Power Supplymentioning

confidence: 99%

Section: Lit With Impulse Power Supplymentioning

confidence: 99%

Section: Modeling Linear Ion Trapsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Dipole and quadrupole resonance excitation in linear quadrupoles

Konenkov

2023

Eur J Mass Spectrom (Chichester)

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Modeling of a linear ion trap with driving rectangular waveforms

Ivanov,

Sysoev,

Konenkov

et al. 2024

J Mass Spectrom

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We consider the operation of a digital linear ion trap with resonant radial ejection. A sequence of rectangular voltage pulses with a dipole resonance signal is applied to the trap electrodes. The periodic waveform is piecewise constant, has zero mean, and is determined by an asymmetry parameter : one value is taken on interval and another on , where is the RF period. Ion mass scanning is performed by varying the asymmetry parameter and amplitude of the negative pulse part with time. The ion oscillation frequencies and acceptance of the linear trap are calculated. The dependence of the ion mass to charge ratio on the parameter is . The maximum value is about kDa for typical parameters of the linear trap: frequency 0.5 MHz, rod radius 4 mm, and negative pulse amplitude 1 kV. The dipolar excitation frequency is 0.125 MHz at which the LIT acceptance is maximal.

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