Patent ID: 9177775
Filing Date: 2015-11-03
Classification: H01J

Abstract:
1. A mass spectrometer, which introduces ions generated under atmospheric pressure into a vacuum chamber exhausted by vacuum exhausting means and analyzes a mass of the ion, comprising: an electrode, in which ion introduction hole introducing the ion into the vacuum chamber is opened, wherein the ion introduction hole of the electrode is divided into a first region, a second region, and a third region, a central axis direction of the ion introduction hole in both or either one of the first region and the third region is different from a flow direction axis of the ion inside the ion introduction hole in the second region, the second region has no outlet other than outlets leading to the first region and the third region, the electrode can be separated between the first region and the second region or between the third region and the second region or in a midway of the second region, and axes of the ion introduction hole in the first region and the third region are in an eccentric position relationship.