Study of Adsorption of Gases on Solids in the High Vacuum Range
Abstract
The pumping speed of an omegatron mass spectrom eter was determined both in the presence and absence of the ionizing electron beam; when the electron beam is absent the pumping is attributed to chemical effects taking place at the hot tungsten filament. This chemical pumping speed is .0000715 liter/sec. The difference between the two pumping speeds (.00002 liter/sec) repre sents the contribution of electronic pumping to nitrogen removal. These experiments were per formed on sealed-off omegatrons; however similar pumping phenomena are present in any system using hot tungsten filaments, and their relevance in creases as the operating pressures in the experi ments decrease. Preliminary data were obtained on the interaction between oxygen and the carbon contained in the tungsten filament of the omegatron.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 30, 1963
- Accession Number
- AD0410433
Entities
People
- C. M. Bliven
- J. F. Florio
- T. G. Polanyi