Experimental Studies of Low Temperature Surface Interactions of Atomic Hydrogen Using Maser Technique

Measurements with an oscillating hydrogen maser of wall collision frequency shift of atomic hydrogen on surfaces of frozen CF4 at temperatures between 60 K and 30 K indicate the same wall interaction energy as for FEP-Teflon surfaces, but with 3 to 4 times less wallshift. This indicates that the sur...

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Bibliographic Details
Main Authors: Vessot,R F C, Mattison,E M
Format: Report
Language:English
Subjects:
CARBON TETRAFLUORIDE
COATINGS
Coatings, Colorants and Finishes
COLLISIONS
COOLING
CRYOGENICS
FREEZING
FREQUENCY SHIFT
FREQUENCY STANDARDS
HYDROGEN
MASERS
OSCILLATORS
PE61153N
Physical Chemistry
SURFACE REACTIONS
SURFACES
TETRAFLUOROETHYLENE RESINS
WALLS
WUNR407005
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Summary:Measurements with an oscillating hydrogen maser of wall collision frequency shift of atomic hydrogen on surfaces of frozen CF4 at temperatures between 60 K and 30 K indicate the same wall interaction energy as for FEP-Teflon surfaces, but with 3 to 4 times less wallshift. This indicates that the surfaces of Teflon have 3 to 4 times the area of those of CF4. A substantial improvement in wall coating performance is shown to be possible with the coatings. Originator furnished keywords include: Atomic hydrogen maser oscillator; Frequency standard cryogenic cooling; Wall coatings; Wallshift.