The invention discloses an
ion source suitable for a
flight time mass spectrometer, which relates to an
ion source for a
mass spectrometer. The
ion source is provided with a sample introduction
booster pump, a
solenoid valve, a repulsion
electrode, an
ionization chamber, a middle grid, an extraction grid, a focusing
electrode, an emergent
pole piece and an excitation source generator, wherein theoutlet of the sample introduction
booster pump is communicated with the inlet of the
solenoid valve; the outlet of the
solenoid valve is communicated with the inlet of the repulsion
electrode; the repulsion electrode is arranged in the inlet end of the
ionization chamber; the middle grid is arranged at the outlet end of the
ionization chamber; the extraction grid is arranged at the side of the middle grid; the focusing electrode and the emergent
pole piece are successively arranged at the side of the extraction grid; the focusing electrode and the emergent
pole piece are both provided with a central ion extraction through hole; the
ionization chamber, the repulsion electrode, the middle grid, the extraction grid, the focusing electrode and the emergent pole piece are coaxial; a filament is arranged out of the upper end and the lower end of the
ionization chamber; and the excitation source generator faces to an energy beam incidence hole arranged on the
ionization chamber. According tothe
ion source, a pulse ion group can be generated, the ion extraction efficiency is greatly improved, the ion use ratio is improved, and the sensitivity of the
mass spectrometer is improved.