GaAs(110)
|
Efin = 17 eV |
Efin = 30 eV |
Efin = 70 eV |
| Ein = -2.0 eV |
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| Ein = -0.75 eV |
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Photocurrent for different binding and final state
energies. The mesh shows the Brillouin zones, the first Brillouin zone being
the center. The circle indicates the polar angle of 90°.
Even a first glance at these images allows to observe several advantages
full hemisphere data offer:
- Features from the initial state band structure offside the high
symmetry lines become apparent, as in the pattern of the upper left
image.
- Within one Brillouin zone modulations due to the final states are large,
even for surface states such as the dangling-bond state at -0.75 eV.
- Asymmetry and Brillouin zone selection, the lack of intensity in an
entire zone, appear as new characteristics,
describing global properties in the patterns.
- Only full hemisphere data can ensure to exhibit the strongest
emissions and important patterns.
With one or a few detected emission angles, such typical structures
might be missed.
 Photoelectron angular distribution
contains a wealth of information.
Most important features in photocurrent
distributions can only be seen in full hemisphere scans.
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