| 摘要 |
An ionizer for a quadrupole filter mass spectrometer has an ion volume ring which surrounds the filament and ionization chamber for 360 DEG . Heat from the filament is absorbed by the ring which suppresses secondary electron emission and directs electrons to the ionization chamber. The ion volume ring is in heat conducting relationship with accelerating and focusing electrodes to transfer heat to the electrodes to reduce contamination. The ion volume ring is electrically connected and is at the same potential as the filament.
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