TIME-OF-FLIGHT MASS-SPECTROMETER PROVIDED WITH GAS PHASE ION SOURCE AND METHOD FOR INSTALLING ELECTRODE ON VACUUM HOUSING

摘要

PURPOSE: To provide a flying time mass spectrometer with a gaseous ion source in which a particle density in an extracting volume is high and a residual gas pressure is low in an ion passage between the extracting volume and a detector. CONSTITUTION: A flying time mass spectrometer is devided into a plurarity of areas having different pressures (p1, p2) and neighboring areas are connected to each other with a gas-flow control member 3. In order to seal up an extracting volume, the gas-flow control member 3 is directly integrated with an accelerating electrode 2 for an ion source.