CPC H01J 49/063 (2013.01) [F16K 1/2007 (2013.01); H01J 49/005 (2013.01); H01J 49/0077 (2013.01); H01J 49/022 (2013.01); H01J 49/065 (2013.01); H01J 49/067 (2013.01); H01J 49/068 (2013.01); H01J 49/105 (2013.01); H01J 49/421 (2013.01); H01J 49/4215 (2013.01)] | 17 Claims |
1. An ion optical arrangement for use in a mass spectrometer comprising:
electrodes comprising a multipole arrangement defining an ion optical axis, and
a voltage source for providing voltages to the electrodes to produce electric fields, wherein the ion optical arrangement is configured for producing a radio frequency electric focusing field for focusing ions on the ion optical axis, and
wherein the radio frequency electric focusing field has a varying frequency so as to reduce any mass dependence of ion trajectories through the ion optical arrangement.
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