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    • 3. 发明专利
    • MASS SPECTROMETER
    • JPH0320663A
    • 1991-01-29
    • JP15549289
    • 1989-06-16
    • SHIMADZU CORP
    • NAGATO KENKICHI
    • G01N27/62H01J49/18
    • PURPOSE:To obtain a large amount of analytical data within a short time by providing a discharge electrode in a thermospray ion source chamber and turning the voltage applied to the discharge electrode ON/OFF at a high speed and performing mass scanning in synchronous relation to the ON/OFF operation of said voltage. CONSTITUTION:The thermospray fine pipe 3 connected to the column of a liquid chromatograph LC is inserted in a thermospray ion source chamber 1 and heated by a heater 4. Ion extruding voltage is applied to the repeller elec trode 5 arranged in the chamber 1 and, further, a skimmer 6 is provided in the chamber 1 in opposed relation to the electrode 5 and an ion is extruded in a mass spectrometric space through the small hole provided to the leading end of the skimmer 6. Next, a control circuit 13 turns a switch Sw ON/OFF and controls a voltage source 12 in synchronous relation to the ON/OFF opera tion and mass scanning is performed once at each time when the switch Sw is turned ON and OFF by a mass analyzing part 8. Herein, when the switch Sw is turned ON, a voltage source 11 is operated to perform discharge in the chamber 1. The output of an ion detector 9 is the measuring output of two kinds of mass spectra and taken in the circuit 13 to be recorded.