Three-dimensional quadrupole mass spectrometer
AssigneeHitachi, Ltd.
InventorsMasayoshi Yano, Kohei Mochizuki
Life of this patent
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Abstract
A three-dimensional quadrupole mass spectrometer is suitable for preventing occurrence of a situation where the mass spectrometry cannot be conducted by an excessive existence of ions in a three-dimensional ion confining space, an amount of ions emitted from an ion source 1 is detected by a first electrode 3 of a lens, an output signal therefrom is inputted to a power supply 17 of a second electrode 4 of the lens and a focusing condition of ions caused by the lens is changed such that an amount of ions existing in the three-dimensional ion confining space does not exceed a certain level.
Claims19
A three-dimensional quadrupole mass spectrometer comprising:
- an ion former for forming ions;
- electrodes for forming an electric field in a three-dimensional ion confining space;
- a voltage controller for forming a three-dimensional quadrupole electric field in the three-dimensional ion confining space by applying a periodic voltage to the electrodes such that said ions formed by the ion former are confined into the three-dimensional ion confining space, wherein the voltage controller controls the periodic voltage such that said ions having a desired mass/charge ratio are emitted from the three-dimensional ion confining space;
- a detector for detecting an estimated amount of said ions existing in the three-dimensional ion confining space by detecting the ions before entering the three-dimensional ion containing space;
- and
- a restrictor to restrict ion density being introduced to the three-dimensional ion confining space.
A three-dimensional quadrupole mass spectrometer comprising:
- an ion former for forming ions;
- electrodes for forming an electric field in a three-dimensional ion confining space;
- a voltage controller for forming a three-dimensional quadrupole electric field by applying a periodic voltage to the electrodes such that said ions formed by the ion former are confined to the three-dimensional ion confining space;
- wherein the voltage controller controls the periodic voltage such that said ions having a desired mass/charge ratio are emitted from the three-dimensional ion confining space;
- a detector for detecting an estimated amount of said ions by detecting the ions before entering the three-dimensional containing space and generating an electric signal corresponding to the amount of the estimated amount of ions existing in the three-dimensional ion confining space;
- and
- a restrictor restricting the amount of the ions existing in the three-dimensional ion confining space by controlling ion density introduced to the three-dimensional ion confining space such that the amount of the ions does not substantially exceed a predetermined level based on the generated electric signal.
A three-dimensional quadrupole mass spectrometer comprising:
- an ion former for forming ions in a three-dimensional ion confining space;
- electrodes for forming an electric field in the three-dimensional ion confining space;
- a voltage controller for forming a three-dimensional quadrupole electric field by applying a periodic voltage to the electrodes such that said ions formed by the ion former are confined to the three-dimensional ion confining space;
- wherein the voltage controller controls the periodic voltage such that said ions having a desired mass/charge ratio are emitted from the three-dimensional ion confining space;
- a detector for detecting an estimated amount of said ions in the three-dimensional confining space by detecting ions emitted from the three-dimensional ion confining space and generating an electric signal corresponding to the amount of the estimated amount of said ions existing in the three-dimensional ion confining region;
- and
- a restrictor restricting the amount of the ions existing in the three-dimensional ion confining space by controlling ion density introduced to the three-dimensional ion confining space such that the amount of the ions does not substantially exceed a predetermined level based on the generated electric signal.
Dependencies are inferred from the claim text.