An analyzer tube for mass spectrometry comprises a body tube having a central axis, a part of which extends along an arc, and a pair of magnetic poles, each provided on the respective window formed in a side wall of the body tube. One end portion of the magnetic pole projects into an interior of the...http://www.google.de/patents/US4947041?utm_source=gb-gplus-sharePatent US4947041 - Analyzer tube for mass spectrometry
