| 摘要 |
PCT No. PCT/GB94/00407 Sec. 371 Date Aug. 15, 1995 Sec. 102(e) Date Aug. 15, 1995 PCT Filed Mar. 3, 1994 PCT Pub. No. WO94/20978 PCT Pub. Date Sep. 15, 1994An ion gun comprises an at least part annular ion source (1,2,3), the source being arranged so that ions are extracted from around the source in a direction perpendicular to the plane of the source. Electrodes (8,9,10) adapted to direct ions towards a location that lies on the central axis perpendicular to the plane of the source. The ion gun can be used alone or in combination with an ion detector (13) to provide a mass spectrometry apparatus. |
