On the Ability of Freon (trademark) C-318 to Trap Hydrogen on a 77 K Cryosurface
Final rept. Dec 1970-Jan 1971
ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFB TN
Pagination or Media Count:
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-literssec 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.
- Atomic and Molecular Physics and Spectroscopy