Patent ID: 6147347
Filing Date: 2000-11-14
Classification: H01J

Abstract:
A mass spectrometer comprising:a sample passage through which a sample solution flows towards a tip of the sample passage;a gas passage which produces a gas flow along the sample passage towards an orifice of the gas passage;a gas supplier which supplies a gas to the gas passage so that the gas flow has a velocity effective for spraying the sample solution near the tip of the sample passage; andan analyzer which analyzes a mass of gaseous ions formed from the sample solution sprayed by the gas flow;wherein the gas flow has a characteristic value F/S between 350 meters/second (m/s) and 700 m/s, where F is a flow rate of the gas at standard conditions (20.degree. C., 1 atmosphere), and S is a difference between a cross section of the orifice and a cross section of the sample passage at the orifice.