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- W2072319916 abstract "Modulation of the voltages applied to a quadrupole mass filter (QMF), either RF or RF and DC, leads to splitting of the stability region into islands of stability. The ion optical properties, such as transmission, resolving power and peak tails of the first upper stability islands have been investigated by numerical simulation of ion trajectories. The dependence of the location of this island on the amplitude of the modulation and the parameter ν = ω/Ω = Q/P where ω is modulation frequency, Ω is main angular radio frequency, and Q and P are integers, is calculated in detail. Different methods of adjusting the QMF resolution are examined. It is found that operation at the upper and lower tips of the stability islands created by amplitude modulation of the RF voltage is preferred, because of the technical simplicity of this method and a reduction of the required separation time. Amplitude modulation improves the performance of a QMF constructed with round rods, in comparison to perfect quadrupole fields. For example, with amplitude modulation of the RF, to reach a resolution of R0.1 = 1200 requires only about 75 RF cycles of ion motion in a quadrupole field created by round rods." @default.
- W2072319916 created "2016-06-24" @default.
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- W2072319916 date "2005-03-01" @default.
- W2072319916 modified "2023-10-18" @default.
- W2072319916 title "Upper stability island of the quadrupole mass filter with amplitude modulation of the applied voltages" @default.
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- W2072319916 doi "https://doi.org/10.1016/j.jasms.2004.11.023" @default.
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