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
< 20 meV (17 meV shown with Drift Voltage 10 V)
Simultaneously focused energy range
Up to 10 eV
< 0.01 Å-1
Momentum resolved range
+- 3 Å-1
< 50 nm
Real space field of view
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
6 axis (Hexapod) which makes in situ sample tilt adjustment possible (e.g. for cleaved samples)
< 15 K....400 K (9 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.
Surface Concept GmbH
Am Saegewerk 23a
55124 Mainz / Germany