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.