Accession Number : AD0164653

Title :   Cryosorption Pumping with Frost Sorbents.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON D C

Personal Author(s) : Tempelmeyer,Kenneth E.

Report Date : 12 FEB 1974

Pagination or Media Count : 8

Abstract : The patent describes a system for providing very high vacuums in closed vessels having a hydrogen, helium or neon gaseous atmosphere. The gaseous atmosphere is placed in communication with a cryogenically cooled frost coated structure. The frost is formed on the cooled surface by depositing a sorbent gas, such as carbon dioxide, sulfurdioxide or methyl chloride onto the surface under processing conditions that produce a disordered or amorphous frost structure. The formation technique utilized in forming the frost provides a structure that adsorbs hydrogen, helium or neon gas molecules as they come in contact with the frost surface to a degree not heretofore achieved. As a result, the hydrogen, helium or neon atmosphere is, in effect, pumped out of the closed vessel resulting in the production of a very high vacuum therein.

Descriptors :   *Cryopumping, *Patents, Sorption, Cryogenics, Frost, High vacuum, Gases, Molecular structure, Evacuation

Subject Categories : Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE