Electrodynamic Containment of Charged Particles by Three-Phase Voltages

Abstract

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Ion trap mass analysis at high pressure: A theoretical view

“…This model is expected to be valid at q u lower than 0.7 [59] and relatively more accurate (Ͻ1%) results can be obtained with q u lower than 0.4 [20].…”

“…The minimum notch widths for isolating ions of m/z 195.1 (at 0 ϭ 303 kHz) at a percentage of 95.4%, 84.3%, and 52.1% were calculated over a pressure range of 1 to 250 mTorr ( Figure 5b). Since the rf field in the x-y plane of a 2D ion trap is identical to that of a mass filter, the isolation window width ⌬(m/z) can be calculated from ⌬ 0 using the following equations (see Supplementary Material for additional information) [20,71,74]:…”

Radio frequency quadrupole technology: Evolution and contributions to mass spectrometry

“…Interestingly, the patent contains also a description of an ion trap having a cubic geometry, comprising three opposing pairs of planar electrodes, each pair being coupled to the output from a three-phase RF power supply. Although the shape of the stability diagram for this device was determined experimentally [88], no other reports on ion traps based on this approach appear to have been published. Some ten years after the studies by Langmuir and co-workers, Benilan and Audoin [89], and subsequently Bonner et al [90] fabricated a cylindrical trap that was then characterized in some detail in a joint research program between the current authors' respective groups [91,92].…”

Realistic modeling of ion-neutral collisions in quadrupole ion traps

“…Ion‐neutral collision is an important phenomenon in ion trap operations, which is highly related to ion trapping efficiency, mass resolution, ion dissociation and ion collision cross section measurements. Collisions with buffer gas molecules help to remove the excess kinetic energy of an ion after being injected into an ion trap . As a result, ions will be cooled into the center of the ion trap, which will therefore improve ion ejection efficiency and mass resolution .…”