Module 08: Quadrupole Mass Filter Simulator
← Academy Quadrupole Controls
Four rods, two voltages, one survivor. The quadrupole mass filter uses a combination of DC and RF voltages to create a mass-dependent stability window. Only ions of the selected mass oscillate stably and reach the detector. Everything else crashes into the rods.
28 amu
R = 50
RF Voltage (V)
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DC Voltage (U)
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U/V Ratio
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Rod Radius r0
6.35 mm
RF Frequency
2.0 MHz
Resolution M/dM
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Stability Diagram
Ion Trajectory (cross-section)
Drag the sliders above to explore how the quadrupole selects ions by mass.
Mass Spectrum Builder
Hit SCAN to sweep the RF voltage from low to high, building a mass spectrum bar by bar -- exactly like your MKS MV2 does on every bake station.
Sources · 3
- P.H. Dawson, Quadrupole Mass Spectrometry and Its Applications, Elsevier, 1976 (reprinted AIP, 1995).
- NIST Chemistry WebBook, Mass Spectra.
- MKS Instruments, MicroVision 2 Residual Gas Analyzer : Operating Manual, 2019.