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Abstract

The stability regions formed by the asymmetric sinusoidal shape of the periodic supply potential of the quadrupole mass filter are calculated, with the signal duty cycle $d = 0.5$ . Two cases are considered, when $A_{1} < A_{2}$ and $A_{1} > A_{2}$ , where $A_{1}$ and $A_{2}$ are the amplitudes of the positive and negative parts of the sinusoid. Stability islands are revealed, where the QMF operation is possible by changing amplitude $A_{2}$ without DC potential. For the values $A_{1} = 1$ and $A_{2} = 0.8$ , the mass selected instability mode with a resolution of about 7000 is found. In this island, the potential well depth reaches its maximum along the Y coordinate. At the amplitudes $A_{1} = 1$ and $A_{2} = 1.8 - 2.0$ , stability regions are formed, the operation in which allows reaching $R_{0.5} = 2000$ . The results of the transmission and excitation contours modeling confirm the validity of the method for calculating the stability diagrams of a linear quadrupole with asymmetric sinusoidal waveform.

Keywords

Linear quadrupole sinusoidal asymmetric waveform stability islands ion oscillation frequencies transmission and excitation contours resonance ejection depth of the potential well bandwidth

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Characterization of linear quadrupoles operated with amplitude-asymmetric sinusoidal waveforms

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