| 摘要 |
PROBLEM TO BE SOLVED: To provide a liquid chromatograph mass spectrometer in which a continuous analysis is possible without spending an unnecessary time and labor for cleaning an orifice. SOLUTION: The orifices 11a, 11b are placed and installed at an orifice tray 13 to slide right and left on an orifice base 12 for introducing an ion formed at atmospheric pressure into an evacuated room, one of them is positioned at the center of the orifice base 12 and becomes in a state of using, and the other becomes in a state of cleaning in an orifice cleaning part 16. During the usage of the two orifices by making the orifice tray 13 slide, because the state in the cleaning can be switched quickly, it is not necessary to take an unnecessary time for the cleaning, and the labor to remove and clean the orifices is saved. COPYRIGHT: (C)2005,JPO&NCIPI
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