| 摘要 |
PCT No. PCT/EP89/00751 Sec. 371 Date Feb. 21, 1990 Sec. 102(e) Date Feb. 21, 1990 PCT Filed Jun. 28, 1989 PCT Pub. No. WO90/00309 PCT Pub. Date Jan. 11, 1990.An ICR ion trap comprises electrically conductive side plates (1) extending in parallel to one axis (Z), and electrically conductive end plates (5,6) extending perpendicularly to the said axis (Z). Additional electrode plates (8,9) are arranged at a certain spacing from the said end plates (5,6) and can be supplied with trapping potentials of a polarity opposite to the polarity of the potentials applied to the said end plates so that an outer space is defined in which electrodes of opposite sign are trapped. Following analysis and elimination of the ions contained in the inner space, the ions of opposite sign can be trapped in the inner space for subsequent analysis. The arrangement provides also the possibility to observe recombination reactions between ions of different signs.
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