Quadrupole mass filter operation with dipole direct current and quadrupole radiofrequency excitation

Douglas, D. J.; Konenkov, N. V.

doi:10.1002/rcm.8266

Cited by 7 publications

(21 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Another approach for using X-islands to obtain the resolution about 5000 and transmission 20% was described in literature. 12 The modification of the stability diagram by means of a constant dipole voltage between the Y-rods and an auxiliary rf quadrupole voltage on the X and Y rods have been used. The dipole DC y excitation effectively eliminates peak's tails which shortens the required separation time.…”

Section: Introductionmentioning

confidence: 99%

Stable X-islands of quadrupole mass filter

Konenkov

Seregin

Makhmudov

et al. 2019

Eur J Mass Spectrom (Chichester)

View full text Add to dashboard Cite

Quadrupole mass filters are normally operated as narrow band pass filters by appropriate choices of rf and DC voltages corresponding to Mathieu a and q values near the apex of the first stability region. We add an auxiliary quadrupole excitation potential to the main drive voltage. As a result, stability islands appear on the ([Formula: see text]) plane. The method of the islands mapping on the ([Formula: see text]) plane is discussed in detail. The DC electric field's effect responsible for removing “shadowing” islands has been studied using a combination of analytic theory and computer modeling. We call a narrow stability region elongated along an iso-[Formula: see text] line an X-island. Two such stability islands were found where operation is possible without mass spectra interference when the DC potential is used. Those islands are formed by quadrupole potentials with relative excitation frequencies [Formula: see text] and [Formula: see text], where [Formula: see text] Many other stability X-islands are presented in detail and illustrated by their transmission contours. This data is necessary for experimental testing of the separation mode at those islands. The study demonstrates how to use X-islands to achieve relatively high resolution 4000-12,000 at the transmission of about 28-15%, respectively.

show abstract

Section: Introductionmentioning

confidence: 99%

Stable X-islands of quadrupole mass filter

Konenkov

Seregin

Makhmudov

et al. 2019

Eur J Mass Spectrom (Chichester)

View full text Add to dashboard Cite

show abstract

“…Another advantage of the proposed approach compared with the quadrupole excitation by the auxiliary potential is that it only requires to change three parameters (V, λ, and U) at the mass scanning instead of four (V, V 0 , U, and λ). 11,12 The main problem of the proposed operation mode is the joint stability of several parameters. In order to generate PM quadrupole potential, digital waveform technology (DWT) can be used.…”

Section: Discussionmentioning

confidence: 99%

“…20 Following Konenkov, 12 Figure 1B), we observed one satellite harmonics as in the case of parametric excitation by auxiliary quadrupole potential. 11,12 It was found that stability islands, which can be used in practice, can be created by the phase modulation of ν = 2 ± 1/P, P ffi10 -40, where…”

Section: Frequency Spectrum Of Rf Potentialmentioning

confidence: 99%

“…The modes of quadrupole mass filter (QMF) operation with dipole direct current (DC) and with auxiliary quadrupole excitation have been studied recently. [11][12][13] The effect of the DCy potential is to reduce the area of the first stability region along the line β y = const starting from the stability boundary at β y = 0. DCy potential allows to eliminate Y-islands, which shadow working X-islands.…”

mentioning

confidence: 99%

“…DCy potential allows to eliminate Y-islands, which shadow working X-islands. 11,12 Auxiliary small DC potentials are applied to the pair of rods, which have negative potential. It was shown that among the resonance frequencies, suitable islands for ion separation are given only by the frequencies of =k ± β, where β = 1 P , k = 0,1, 2, and 10 ≤P ≤ 40 for auxiliary quadrupole excitation of confined ions.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Mass filter with phase modulation of radio frequency voltage

Wang

Yan

et al. 2020

J Mass Spectrom

Self Cite

View full text Add to dashboard Cite

In this work, the parametric quadrupole resonance caused by the phase modulation of waveform potential is studied. Based on analytical and numerical description of the ion motion in the quadrupole mass filter with the phase modulation, a stability island is found with good ion optical properties such as high ion transmission efficiency (16%), high mass resolution (peak width measured at 10% of peak height, R 0.1 = 6000), the required separation time (100-150 radio frequency [RF] cycles), and good peak shape of trapezoid form. Furthermore, the analysis of the frequency spectrum of the applied potential and the quadrupole mass filter (QMF) acceptance are also presented; a resonance frequency is found from this spectrum. Finally, a suitable stability X-islands with relative modulation frequency, ν = 2 AE β, β = 1 P ,10 ≤ P ≤ 40 , is established and studied in detail. Here, β is the imaginary part of the characteristic exponent of stable solutions to the Mathieu equation. K E Y W O R D S acceptance, disturbance of the working parameters, parametric resonance, phase modulation, resolution, spectrum of the phase modulated RF potential, X stability island 1 | INTRODUCTION Parametric resonance is the phenomenon of oscillation amplitude increase, occurring when system's parameter changes periodically. 1,2 Ion motion in the quadrupole electric fields can be described by the Mathieu equation 3 : d 2 u dξ 2 + a−2qcos2ξ ð Þ u = 0, ð1Þ where u = x or u = y are transverse dimensionless coordinates, a and q are the Mathieu parameters, and ξ is the dimensionless time. In Equation 1, if one parameter, such as a, q or frequency changes harmonically, for some frequencies, it will lead to parametric resonance. 4 Another way to obtain parametric resonance is to use a small auxiliary quadrupole potential. 5-10 As a result, the area of the first stability diagram is divided by instability bands, which form stability islands. The stability diagram of the first stability region is the area on the plane of a, q parameters where ion displacement always remains finite. The upper island has attracted the attention of researchers first, 4-6 because other islands can cross the scan line a = 2λq. The upper island is located near the working tip of the first stability region of the Mathieu equation. The instability bands follow the iso-β lines on stability diagram. The parameter β characterizes the nature of ion motion in the stable region and determines the spectral composition of the ion oscillation 3 :

show abstract

Simulation study of a planar quadrupole mass filter for MEMS mass spectrometer

CHENG,

SHEN,

et al. 2024

Chinese Journal of Analytical Chemistry

View full text Add to dashboard Cite

Quadrupole mass filter operation with dipole direct current and quadrupole radiofrequency excitation

Cited by 7 publications

References 30 publications

Stable X-islands of quadrupole mass filter

Stable X-islands of quadrupole mass filter

Mass filter with phase modulation of radio frequency voltage

Simulation study of a planar quadrupole mass filter for MEMS mass spectrometer

Contact Info

Product

Resources

About