Mass spectrometer and mass spectrometry for analysing compounds contained in a solution

摘要

A mass spectrometer employing an ion source (6) includes a capillary (2) for spraying therethrough liquid into the atmosphere, and an orifice (3) through which a portion in the vicinity of a tip of the capillary is inserted, the orifice being designed in such a way that gases are caused to flow up to the tip of the capillary along a peripheral wall face of the capillary. The flow rate of gas in the vicinity of the tip of the capillary is about the sonic velocity, and a voltage is applied across the liquid flowing through the capillary and the orifice or an electrode (9, 12) arranged in the vicinity of the tip of the capillary.