| 摘要 |
PURPOSE:To facilitate the identification of unnecessry peaks by monitoring changes in the peak intensity being obtained by varying the intensity of the second electric field in a microscopic rang by several stages when the intensities of the second electric field, the first electric field and the magnetic field of a double convergence mass analyzer are swept keeping the intensity ratio of each of them constant. CONSTITUTION:When intensities of the second electric field E2 arranged before an ion detector 10 of a double convergence mass analyzer, the first electric field E1 in the double convergence mass analysis system 6 and the magnetic field B are swept toward 0 keeping intensity ratio therebetween constant, the intensity of the electric field E2 is varied several times in a microscopic range by stages centered on the initial value E20 by the operation of a potentiometer 18. As a result, the peak changes sequentially recorded on a recorder 12 is plotted to match changes in the electric field E2 and appear near the peak P1 of mass number of a daughter ion to be measured while the peak P2 of the unnecessary daughter ion close in the mass number thereto emerges at the position away from the electric field E20. This facilitates the identification of unnecessary peak. |
