Abstract
The Surfaces of Bismuth exhibit unexpected electronic and vibrational properties. Being a semimetal with metallic surface-behavior, the strong corrugation found by Tamtögl et al. [1]
was rather unexpected but enabled the investigation of elastic surface resonances and thus the measurement of the He-Bi(111) interaction potential. Using the signal enhancement and suppression caused by the bound-state- and threshold-resonance
effects, phonon states located in the bulk can be identified that would otherwise be unaccessible by helium atom scattering.
On the other hand, the enhancement of previously identified surface-phonon modes can improve the accuracy of the information about the bound-state energy in the interaction
potential and thus enable far more detailed insights into the interaction potential between the probe atom and the surface under investigation.
Therefore, several elastic and inelastic helium atom scattering measurements were performed on the Bi(111) surface. Besides the usual angular distribution and time-of-flight measurements, also the temperature-dependence of the elastic specular peak intensity
was measured and compared to predictions for the resonant energies.
[1] A. Tamtögl, JPCM 22, (2010) 304019
was rather unexpected but enabled the investigation of elastic surface resonances and thus the measurement of the He-Bi(111) interaction potential. Using the signal enhancement and suppression caused by the bound-state- and threshold-resonance
effects, phonon states located in the bulk can be identified that would otherwise be unaccessible by helium atom scattering.
On the other hand, the enhancement of previously identified surface-phonon modes can improve the accuracy of the information about the bound-state energy in the interaction
potential and thus enable far more detailed insights into the interaction potential between the probe atom and the surface under investigation.
Therefore, several elastic and inelastic helium atom scattering measurements were performed on the Bi(111) surface. Besides the usual angular distribution and time-of-flight measurements, also the temperature-dependence of the elastic specular peak intensity
was measured and compared to predictions for the resonant energies.
[1] A. Tamtögl, JPCM 22, (2010) 304019
| Original language | German |
|---|---|
| Publication status | Published - 2012 |
| Event | European Conference on Surface Science; 29 (2012) - Edinburgh, Schottland Duration: 3 Sept 2012 → 7 Sept 2012 |
Conference
| Conference | European Conference on Surface Science; 29 (2012) |
|---|---|
| City | Edinburgh, Schottland |
| Period | 3/09/12 → 7/09/12 |
Fields of Expertise
- Advanced Materials Science
Treatment code (Nähere Zuordnung)
- Theoretical
- Experimental