| 摘要 |
The mass spectrometer has a velocity selector (M) which uses conventional perpendicular electric (E) and magnetic (B) fields, arranged such that E = Bv where v is the ion velocity. A Wien filter increases the length of the selector for a given magnetic circuit. A hollow flat electrode (P) allows the ion beam (i) to enter the selector without altering the electric field and producing discontinuities along the length of the magnetic circuit, due to the fact that the flat electrode is aligned with the median equipotential of the electric field produced by the selector electrodes (d).
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