PURPOSE: To obtain a liquid chromatograph/mass spectrometer with an electrostatic spray ion source which enables the obtaining of the intensity of ions stably and intensely.
CONSTITUTION: A spray tubule 11 is arranged with the axis thereof shifted from the center axis of a ion pickup pore. A sample solution eluted from a liquid chromatograph is introduced into the spray tubule 11 through a piping 2 and a connector 10. A voltage of several kV is applied between the spray tubule 11 and an opposed electrode 12 having an ion introduction pore 15 opened thereon to spray the solution electrostatically. A gas such as dry nitrogen flows at a gas jet port 13 for spraying. Liquid drops charged electrically are vaporized to generate ions, which are taken into a mass spectrometric section 6 through the ion introduction pore 15a, a differential exhaust part 19 and an ion introduction pore 15b. A barrier 20a is provided between the tip of the spray tubule 11 and the opposed electrode 12. This enables reduction in temperature changes in the perimeter of the ion introduction pores 15a and 15b thereby observing the intensity of ions stably.
SAKAIRI MINORU
HIRABAYASHI TSUDOI
MAKI ATSUSHI
KANBARA HIDEKI
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