Attenuation of low-energy (<10 eV)O+ions in transmission through adsorbed alkali-metal layers
| Autor: | B. V. Yakshinskii, M. Akbulut, Theodore E. Madey, N. D. Potekhina, V. N. Ageev |
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| Rok vydání: | 1996 |
| Předmět: | |
| Zdroj: | Physical Review B. 54:R5271-R5274 |
| ISSN: | 1095-3795 0163-1829 |
| DOI: | 10.1103/physrevb.54.r5271 |
| Popis: | We report the transmission of low-energy (10 eV) ${\mathrm{O}}^{+}$ ions through adsorbed alkali-metal (Li, Na, K, and Cs) overlayers on an oxidized tungsten substrate. We find that the ${\mathrm{O}}^{+}$ yield is attenuated by the alkali-metal overlayers. For $\ensuremath{\Theta}0.3$ ML, we derive attenuation cross sections of (18\ifmmode\pm\else\textpm\fi{}2)\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}15}$ ${\mathrm{cm}}^{2}$ for Cs, (13\ifmmode\pm\else\textpm\fi{}1)\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}15}$ ${\mathrm{cm}}^{2}$ for K, (5\ifmmode\pm\else\textpm\fi{}1) \ifmmode\times\else\texttimes\fi{} ${10}^{\ensuremath{-}15}$ ${\mathrm{cm}}^{2}$ for Na, and (3.3\ifmmode\pm\else\textpm\fi{}0.3) \ifmmode\times\else\texttimes\fi{} ${10}^{\ensuremath{-}15}$ ${\mathrm{cm}}^{2}$ for Li. We attribute the attenuation of ${\mathrm{O}}^{+}$ in alkali-metal films for $\ensuremath{\Theta}0.3$ ML mainly to resonance electron tunneling from adsorbed alkali-metal atoms to excited states of oxygen. |
| Databáze: | OpenAIRE |
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