Patent ID: 8866070
Filing Date: 2014-10-21
Classification: H01J

Abstract:
1. A mass spectrometer comprising: an ion source adapted to ionize gas flowing in from outside in order to ionize a measurement sample; a mass spectroscopy section for separating said ionized measurement sample, wherein: said ion source has its interior reduced in pressure by differential pumping from said mass spectroscopy section and ionizes said gas when its interior pressure rises up to about 100 Pa to about 10,000 Pa as it inhales said gas; said mass spectroscopy section is controlled by a control part to separate said ionized measurement sample when its interior pressure raised concomitantly with inhale of said gas falls to about 0.1 Pa or lower after inhale of said gas; a restriction device for suppressing a flow rate of the gas that the ion source inhales; an open/close device for opening and closing a flow of the gas that the ion source inhales; and the restriction device and the open/close device are arranged on an upstream side of flow of the gas with respect to the ion source.