The ToF Momentum Microscope works this way: The zoom optics 1 select a real-space sample area, the switching between real-space and k-space-image is done by the zoom optics 2.
[Medjanik et al., Nature Materials, 16(6):615-621(2017)]
The user can access the full space of the photoemission paraboloid from work function cut-off to Fermi edge during one measurement (approved for excitation energies up to 21.7eV). The optics is isogenic in k for a wide range of energies.
Technical specifications for a complete Momentum Microscope system including the hexapod sample stage.
| ToF Momentum Microscope | |
|---|---|
| Energy resolution | < 20 meV (17 meV shown with Drift Voltage 10 V) |
| Simultaneously focused energy range | Up to 10 eV |
| Momentum resolution | < 0.01 Å-1 |
| Momentum resolved range | +- 3 Å-1 |
| Lateral resolution | < 50 nm |
| Real space field of view | 11....1000 μm |
| Piezo driven contrast aperture | 3 aperture sizes and a 200 mesh, x/y adjustable |
| Piezo driven field aperture | 9 aperture sizes (down to 10 μm possible and a 200 mesh, x/y adjustable |
| Motorized manipulator | 6 axis (Hexapod) which makes in situ sample tilt adjustment possible (e.g. for cleaved samples) |
| Temperature range | < 30 K....400 K (12 K shown) |
Constant-energy maps measured at various photon energies of Re (0001).
[H.J. Elmers et al. PhysRevResearch.2.013296]
Real space image of an Au on Si (Chessy) sample.
FoV 11 µm.
The EPICS (https://epics-controls. org) based software supports fully remote controlled measurements via PC. The server-client architecture enables customized, automatic measurement routines via user scripts.
You can integrate additional customer specific devices by implementing further EPICS modules.
