| 摘要 |
PROBLEM TO BE SOLVED: To provide a spray ionization interface capable of preventing introduction of charged particles to a vacuum device, suitable for ionization of a low flow-volume liquid and a supersensitive mass spectrometer. SOLUTION: The ion source is provided with a capillary 1 with its outer and inner diameter tapered toward the tip of one end and with a liquid sample introduced from the other end, a gas guide tube 6 flowing gas along an outer periphery of the one end side and spraying the liquid sample from the one end, and a gas lead-in part 5 introducing gas to the gas guide tube. At the side where the one end side is inserted, the inner diameter of the gas guide tube is formed tapered toward the one end. An ion gas generated is introduced into a vacuum part 9 from an ion take-in part inlet 7 and mass-analyzed with a mass spectrometer. The vicinity of the one tip end side of the capillary 1 is fixed inside the gas guide tube 2 with a holding member 3 and the capillary 1 is fixed inside an ion source housing with a plug 4. Charged particles are removed outside by a suction port 8. COPYRIGHT: (C)2004,JPO
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