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Anomalous X-Ray yields under surface wave resonance during reflection high energy electron diffraction and adatom
1Graduate School of Science, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 1 13, Japan.
Physical Review Letters
|September 16, 2000
Summary
Researchers studied indium (In) adatom sites on a silicon (Si) surface using electron beam irradiation. Anomalous X-ray emissions revealed the T4 model better explains adatom positioning than the H3 model.
Area of Science:
- Surface science
- Solid-state physics
- Materials science
Background:
- Understanding adatom behavior is crucial for surface science and materials development.
- The Si(111)-sqrt[3]xsqrt[3]-In system is a well-studied surface reconstruction.
Purpose of the Study:
- To determine the precise atomic structure of indium (In) adatoms on a Si(111)-sqrt[3]xsqrt[3] surface.
- To investigate the influence of surface wave resonance on X-ray emission.
Main Methods:
- In L X-ray emissions were measured as a function of incident glancing angle.
- Electron beam irradiation was used to induce X-ray emissions.
- Dynamical calculations were employed to analyze X-ray intensities.
Main Results:
- Anomalous X-ray intensities were observed under surface wave resonance conditions.
- These anomalies were explained by changes in the electron wave field density at adatom sites.
- The T4 model provided a better fit to the experimental data than the H3 model.
Conclusions:
- The study successfully determined the adatom site of In on Si(111)-sqrt[3]xsqrt[3].
- The T4 model is proposed as the more accurate structural model for this system.
- The findings contribute to a deeper understanding of surface reconstructions and adatom bonding.