The Physical Basis of Ultrahigh Vacuum - P.A. Redhead, J.P. Hobson, E.V. Kornelsen - Google Books

http://books.google.de/books?id=ptoEBSTpzLEC&pg=PA412&lpg=PA412&dq=Orbitron+pump&source=bl&ots=JZCpvcblBJ&sig=W0fF54qmW99mfqgaxz

Market: Those involved in the design and use of UHV component systems. Written 25 years ago, this book explains both the design and use of UHV systems and components, as well as the underlying physical principles on which the performance of the equipment…