| 摘要 |
PURPOSE:To make it possible to simultaneously detect daughter ions, by arranging a two-dimensional detector in a position where a double convergence condition is effected to a series of daughter ions generated from one parent ion and having different values of mass. CONSTITUTION:An ions beam emitted from an unillustrated ion source and accelerated to have prescribed energy passes through a main slit 1 to be incident on an Wien filter 3. A series of daughter ions having different values of mass are generated due to dissociation in a free space in the mean time. Since these daughter ions have almost equal speed to that of a parent ion, they pass through the filter 3 en mass e when this speed satisfies the Wien condition and the ions except these can not pass through because they do not satisfy the Wien condition. A beam having passed through the filter 3 is spatially separated according to a difference in each mass by a magnet 4 for performing primary angle alpha convergence and speed beta convergence. The condition of double convergence is effected at the point where the surface 5 for performing this alpha convergence and the surface 6 performing, beta convergence are accorded with each other. Accordingly, when a two-dimensional detector is placed in the position of the above two convergence surfaces, simultaneous detection of the daughter ions can be made.
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