Voltage is applied to each rod
- A RF voltage (V cos (wt)) and a DC voltage (U) are simultaneously applied to the facing rods.
- The RF and DC with the same magnitude but the opposite sign are applied to another pair of rods.
The angular frequency of RF is denoted by w=2pf. The two voltages U and V determine the mass passing through the rods. When U and V voltages are continuously varied with constant U/V, we can obtain the scan data and mass spectrum.
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