Quadrupole mass filter and quadrupole type mass spectrometry device

Abstract

This invention comprises, disposed in front of a main electrode portion (31), a pre-electrode portion (32) having a two-stage constitution wherein a front-stage pre-electrode part (32A) and a back-stage pre-electrode part (32B) are applied a high-frequency voltage having the same frequency as the high-frequency voltage applied to a rod electrode of the main electrode portion (31), and having an amplitude that decreases in steps in the forward direction. By suitably adjusting the amplitude, the match between the emittance and the acceptance of an injected ion beam can be improved so that the smaller the amplitude of the high-frequency voltage, the larger the acceptance of ions. The ion transmittance of the entirety of the quadrupole mass filter (3) is influenced more by the transmittance when the ions enter into the pre-electrode portion (32) and the transmittance when the ions enter from the pre-electrode portion (32) into the main electrode portion (31) than the transmittance within the pre-electrode portion (32). Thus, by improving these transmittances, the ion transmittance can be improved for the entirety of the quadrupole mass filter (3).

Description

technical field [0001] The invention relates to a quadrupole mass filter for selecting ions with a specific mass-to-charge ratio m / z and a quadrupole mass spectrometer using the quadrupole mass filter as a mass separator. Furthermore, the quadrupole mass spectrometry device mentioned here not only includes a common single quadrupole mass spectrometry device using a quadrupole mass filter as the only mass separator, but also includes two quadrupole mass spectrometry devices for MS / MS analysis. A triple quadrupole mass spectrometer with a quadrupole mass filter, and a Q-TOF mass spectrometer that uses a time-of-flight mass separator to separate and detect ions based on the mass-to-charge ratio after dissociation of the ions selected by the quadrupole mass filter . Background technique [0002] In a single quadrupole mass spectrometer, various ions generated from a sample are introduced into a quadrupole mass filter to selectively pass only ions with a specific mass-to-charge ...

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Problems solved by technology

[0015] However, according to studies based on simulation calculations by the inventors of the present invention, even in the above-mentioned quadrupole mass filter provided with pre-rod electrodes, a considerable part of the ions entering the quadrupole mass filter It will also be wasted, and there is still a lot of room for improvement in the ion transmittance

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