| 摘要 |
The present invention relates to a mass spectrometry device that can perform highly robust, highly sensitive, and low-noise analysis. The present invention addresses the problems of preventing reductions in ion transfer efficiency and of suppressing the introduction of noise components from droplets, etc. The present invention has an ion source that generates ions, a vacuum chamber that is evacuated by an evacuation means and that is for analyzing the mass of ions, and an ion introduction electrode (12) that introduces ions into the vacuum chamber. The present invention is characterized in that the ion introduction electrode (12) has an ion-source-side front-stage pore (35), a vacuum-chamber-side rear-stage pore (36), and an intermediate pressure chamber (33) that is between the front-stage pore (35) and the rear-stage pore (36), in that the cross-sectional area of an ion inlet of the intermediate pressure chamber (33) is larger than the cross-sectional area of the front-stage pore (35), in that the position of the central axis of the front-stage pore (35) and the position of the central axis of the rear-stage pore (36) are eccentric, and in that the cross-sectional area of an ion outlet of the intermediate pressure chamber (33) is smaller than the cross-sectional area of the ion inlet. |
