Patent ID: 9543135
Date: 2017-01-10
CPC Classifications: H01J

Claim:
1. A mass spectrometer comprising: a sample vessel in which a water solution containing sample molecules is sealed, where at least some of sample is vaporized; an ionization housing connected to the sample vessel by a first pipeline having a pulse valve connected thereto and to the ionization housing, and having a discharge ionization source of taking in a gas containing vaporized sample molecules and water molecules which are present in the sample vessel and ionizing the sample molecules by ion molecule reaction, the pressure being lower than the pressure inside of the sample vessel, the pulse valve configured to discontinuously introduce the gas into the ionization housing; a vacuum chamber connected to the ionization housing, said vacuum chamber having a pump coupled thereto, said pump configured to maintain a pressure of the vacuum chamber at 0.1 Pa or lower, and said vacuum chamber having a mass analyzer for analyzing the ionized sample by m/z; and means for decreasing the pressure inside of the sample vessel, wherein the means for decreasing the pressure inside of the sample vessel is connected to a second pipeline in which the other side of the second pipeline is connected to the sample vessel or the first pipeline.