Quadrupole devices
AssigneeMicromass UK Limited
InventorsDavid J. Langridge, Martin Raymond Green
Life of this patent
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Abstract
A method of operating a quadrupole device (10) is disclosed. The quadrupole device (10) is operated in a mode of operation by applying a repeating voltage waveform comprising a main drive voltage and at least one auxiliary drive voltage is applied to the quadrupole device to the quadrupole device (10). The intensity of ions passing into the quadrupole device is varied with time in synchronisation with the repeating voltage waveform. This may be done such that the number of ions per unit phase which initially experience a phase within a first range of phases of the repeating voltage waveform is greater than the number of ions per unit phase which initially experience a phase within a second range of phases of the repeating voltage waveform.
Claims20
A method of operating a quadrupole device, the method comprising:
- operating the quadrupole device in a mode of operation in which a repeating voltage waveform comprising a main drive voltage and at least one auxiliary drive voltage is applied to the quadrupole device;
- passing ions into the quadrupole device;
- and
- varying the intensity of the ions passing into the quadrupole device in synchronisation with the repeating voltage waveform.
Apparatus comprising:
- a quadrupole device;
- one or more voltage sources configured to apply a repeating voltage waveform comprising a main drive voltage and at least one auxiliary drive voltage to the quadrupole device;
- and
- one or more devices configured to cause the intensity of ions passing into the quadrupole device to vary in synchronisation with the repeating voltage waveform.
Apparatus comprising:
- a quadrupole device;
- one or more voltage sources configured to apply a repeating voltage waveform comprising a main drive voltage and at least one auxiliary drive voltage to the quadrupole device;
- and
- one or more devices configured to cause the intensity of ions passing into the quadrupole device to vary such that the number of ions per unit phase which initially experience a phase within a first range of phases of the repeating voltage waveform is greater than the number of ions per unit phase which initially experience a phase within a second range of phases of the repeating voltage waveform.
Dependencies are inferred from the claim text.