| Autor: |
J. T. Keeley, E.F. Greene, D. K. Stewart |
| Rok vydání: |
1984 |
| Předmět: |
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| Zdroj: |
The Jerusalem Symposia on Quantum Chemistry and Biochemistry ISBN: 9789401088152 |
| DOI: |
10.1007/978-94-009-5237-9_15 |
| Popis: |
Beams of alkali atoms incident on heated surfaces of semiconductors produce ions by losing electrons to the surfaces. Potassium atoms on surfaces of Si (100) and graphite serve as examples of how surface ionization can provide information about the surfaces and their interactions with the atoms. The Si surface appears to undergo a phase transition at Tc = 980 ± 20K. At higher temperatures the atoms move freely over what we presume is a relatively smooth surface. At lower temperatures the atoms collect in a small number of special sites where they are bound more tightly and concentrated so they interact with each other but remain essentially in equilibrium with a small fraction that move over the remaining surface. On highly oriented pyrolytic graphite K ions are bound on at least three different kinds of sites between which the ions move at an appreciable rate but not rapidly enough to reach equilibrium. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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