Trapping of Helium Ions and the Re‐Emission of Trapped Atoms from Molybdenum

Autor:	L. J. Varnerin, J. H. Carmichael
Rok vydání:	1957
Předmět:	Condensed Matter::Quantum Gases Range (particle radiation) General Physics and Astronomy chemistry.chemical_element Trapping Ion chemistry Molybdenum Helium ions Physics::Atomic and Molecular Clusters Physics::Atomic Physics Atomic physics Saturation (chemistry) Helium
Zdroj:	Journal of Applied Physics. 28:913-919
ISSN:	1089-7550 0021-8979
DOI:	10.1063/1.1722887
Popis:	The electrical cleanup of helium on molybdenum surfaces has been investigated. In this case, the phenomenon can be described by a trapping of ions upon impact with the surface. Measurements of the trapping efficiency η (atoms removed/ions collected) have been made over a range of ion energies from 150 to 2600 ev. The re‐emission of trapped helium atoms was investigated in detail. The contribution of re‐emission to the pumping process is described by a phenomenological theory. The results indicate that the trapping efficiency is lowered by a short time re‐emission of trapped atoms. Through the long‐time re‐emission of atoms, the theory accounts quantitatively for the observed saturation of the cleanup process.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::29cfa739b630189bc695fa8047d4fd6e https://doi.org/10.1063/1.1722887 Zobrazit plný text záznamu