Mass spectrometer
First Claim
1. A mass spectrometer, comprising:
- an ion ejection device that ejects pulsed ions;
a linear multipole unit having means for generating a voltage potential slope along a center axis of the linear multipole unit;
a power supply unit having a first power supply that applies a radio frequency voltage to the linear multipole electrode and a second power supply that applies a DC voltage to the means for generating a voltage potential slope along the center axis of the linear multipole unit;
a controller that controls the second power supply, thereby controlling the voltage potential formed on the center axis of the linear multipole electrode; and
a detector that detects ions ejected from the linear multipole unit, whereinthe controller controls the second power supply to raise or lower the voltage during ion ejection.
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Accused Products
Abstract
A mass spectrometer includes a linear multipole electrode, an auxiliary electrode that applies a DC potential on the center axis of the linear multipole electrode, and a DC power supply that supplies a DC power to the auxiliary electrode. The DC potential slope formed on the center axis of the multipole electrode is changed according to the measuring condition. The ejection time of ions can be adjusted optimally by adjusting the potential slope so as to satisfy the measuring condition. If the ejection time of ions is shortened, confusion of different ion information items that might otherwise occur on a spectrum can be avoided. If the ejection time of ions is lengthened, detection limit exceeding can be avoided and ions can be measured efficiently, thereby highly efficient ion measurements are always assured.
26 Citations
23 Claims
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1. A mass spectrometer, comprising:
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an ion ejection device that ejects pulsed ions; a linear multipole unit having means for generating a voltage potential slope along a center axis of the linear multipole unit; a power supply unit having a first power supply that applies a radio frequency voltage to the linear multipole electrode and a second power supply that applies a DC voltage to the means for generating a voltage potential slope along the center axis of the linear multipole unit; a controller that controls the second power supply, thereby controlling the voltage potential formed on the center axis of the linear multipole electrode; and a detector that detects ions ejected from the linear multipole unit, wherein the controller controls the second power supply to raise or lower the voltage during ion ejection. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 23)
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21. A mass spectrometer, comprising:
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an ion ejection device ejecting pulsed ions; a linear multipole unit having a center axis and a plurality of first electrodes and at least one second electrode; a first power supply applying a radio frequency voltage to the plurality of first electrodes; a second power supply applying a DC voltage to the at least one second electrode; a controller controlling the second power supply, thereby controlling the voltage potential formed on the center axis of the linear multipole electrode, and a detector detecting ions ejected from the multipole unit, wherein the controller controls the second power supply to raise or lower the voltage during ion ejection. - View Dependent Claims (22)
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Specification