Atmospheric pressure corona discharge ionization system and ionization method

摘要

PROBLEM TO BE SOLVED: To provide an atmospheric pressure corona discharge ionization system and an ionization method, capable of specifying or controlling reactant ion species important for identification of a sample material.;SOLUTION: A tip part of a needle electrode (1) is disposed in an ionization region (α) under the atmospheric pressure. Atmospheric components or solvent molecules are ionized by a corona discharge at the needle electrode to generate reactant ions (Y^-). Sample ions (M+Y^-) are generated by the reaction of sample molecules (M) and the reactant ions, and introduced into orifices (7, 11, 21) of a mass spectroscope (MS). The needle electrode includes a tip surface (4) formed on a curved surface. A relative position of the tip surface and the orifice is fixed by setting a relative position or a relative angle of the needle electrode, or an electric potential gradient of an electric field generated in the ionization region is controlled. Thereby, ionic species of the reactant ions flowing into the orifice are specified or controlled.;COPYRIGHT: (C)2013,JPO&INPIT