| 摘要 |
A mass spectrograph has an ionization chamber for ionizing a sample, a skimmer in a conical shape with an orifice and a bottom opening, an analyzing chamber at a lower pressure than inside the ionization chamber such that ions generated in the ionization chamber are pulled through the orifice into the analyzing chamber, and a multi-pole ion guide disposed proximally behind the skimmer. The ion guide has an even number of cylindrically shaped electrodes all elongated in the axial direction of the skimmer and the ion guide and disposed so as to circumscribe an inscribed circle and such that the conical surface of the skimmer, when extended, intersects the internally facing side surfaces of the electrodes, not their front surfaces facing the skimmer. Thus, the generated ions can reach the analyzing chamber more efficiently.
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