On the Ability of Freon (trademark) C-318 to Trap Hydrogen on a 77 K Cryosurface
Abstract
Studies of the trapping of hydrogen and helium by condensing Freon C- 318 (C4F8) on a 77K surface have indicated that no pumping of the gases occurred. Freon was added to a predominately hydrogen atmosphere at rates from 1.52 x 10 to the -3rd to 0.73 torr-liters/sec with no change recorded in the partial pressure of hydrogen. A similar experiment was made with helium and no pumping was noted. It was observed that the mass spectrometer indicated a significant reduction in the partial pressure of hydrogen when the total pressure in the chamber increased to the 0.0001 to 0.001 torr range. It was shown that this was not due to hydrogen pumping but to internal scattering and resulting nonlinearity of the mass spectrometer in this pressure range.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1971
- Accession Number
- AD0730271
Entities
People
- Jerry Coble
- Ronald Dawbarn
Organizations
- Arnold Engineering Development Complex