Barium Absorption Pumps for High‐Vacuum Systems

Autor:	Lars Beckman, Robert W Cloud, J. G. Trump
Rok vydání:	1957
Předmět:	Materials science chemistry business.industry Ionization Ultra-high vacuum Optoelectronics chemistry.chemical_element Barium Absorption (electromagnetic radiation) business Instrumentation Evaporation (deposition)
Zdroj:	Review of Scientific Instruments. 28:889-892
ISSN:	1089-7623 0034-6748
DOI:	10.1063/1.1715756
Popis:	A simple high‐vacuum pump which combines large areas of evaporated barium with a source of ionization is described. Though of moderate pumping speed this barium‐ionization pump is capable of maintaining high vacuum in unoutgassed sealed‐off systems even in the presence of organic sealing materials. Simplicity is achieved by use of externally applied heat for barium evaporation which may be performed initially or periodically as required. Data are presented which show the capabilities and limitations of such absorption systems. The similarity of this absorption process to that producing oxidation of metals in air is noted.
Databáze:	OpenAIRE
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