Room temperature adsorption of Na on Si(111)-7×7 as studied by resonant optical second harmonic generation
| Autor: | G. Marowsky, H.-G. Rubahn, I.V. Kravetsky |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Silicon
Analytical chemistry chemistry.chemical_element Second-harmonic generation Surfaces and Interfaces Laser pumping Condensed Matter Physics Polarization (waves) Surfaces Coatings and Films Adsorption chemistry Atomic electron transition Angle of incidence (optics) Materials Chemistry Harmonic Atomic physics |
| Zdroj: | Surface Science. 474:47-54 |
| ISSN: | 0039-6028 |
| Popis: | Resonantly enhanced optical second harmonic generation at a pump laser energy of 1.17 eV was applied to investigate the Na-adsorption process on the 7×7 reconstructed Si(1 1 1) surface at room temperature. The change of second harmonic (SH) intensity as a result of Na deposition at normal incident pump radiation varies significantly from that measured at 45° angle of incidence. The observed difference can be explained in terms of electronic transitions from the rest-atom state to the adatom state of the 7×7 reconstructed Si(1 1 1) surface as well as of the features of Na growth on the silicon surface. By measuring the SH polarization dependence for different stages of Na deposition, a change of the interface symmetry in both directions, namely, parallel and perpendicular to the (1 1 1) plane, was clearly observed at the very beginning of the adsorption process. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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