Mass spectrometer
AssigneeHitachi, Ltd.
InventorsHideki Hasegawa, Yuichiro Hashimoto, Izumi Waki
Life of this patent
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Abstract
In a mass spectrometer in which a high ion dissociation efficiency is possible, inserted electrodes are arranged with a form divided into two or more in the axial direction of the ion trap, an electric static harmonic potential is formed from a DC voltage applied to the inserted electrodes, and with an Supplemental AC voltage applied, ions in the ion trap are oscillated between the divided inserted electrodes in the axial direction of the ion trap by resonance excitation, and the ion with a mass/charge ratio within a specific range is mass-selectively dissociated. Thus, a high ion dissociation efficiency is realized by the use of ion trap of the present invention.
Claims7
A mass spectrometer comprising:
- an ion source for generating ions;
- an ion trap for at least two of storing, isolating, dissociating, and removing ions;
- electric-field forming electrodes for forming an electric field along the axial direction of the ion trap, wherein the electric field is formed from an electrostatic potential;
- a power supply unit for controlling operation of the ion trap;
- and
- a detector for detecting ions ejected from the ion trap;
- wherein the power supply includes an Supplemental AC power supply applying a Supplemental AC voltage to the electric field forming electrodes, and with the Supplemental AC voltage applied to the electric field forming electrodes, the ions in the ion trap are oscillated in the axial direction of the ion trap by resonance excitation, and thereby the ions within a predetermined mass/charge ratio range are mass-selectively dissociated.
Dependencies are inferred from the claim text.