This low energy beamline serves the permanent stations for angle-resolved photoelectron spectroscopy, One Cube and One Square ARPES. It is designed to deliver a high flux of photons with very high energy resolution in the range from 5 to 250 eV. In addition to its normal operation with grazing incidence angles, the monochromator also offers a normal incidence option to retain flux and polarization at the lowest energies.
Optical layout of the beam-line (top view)
|Temperature range||1 - 50 K|
|Pressure range||For details contact the Instrument Scientist.|
|More details||ARPES One-Cube|
|Source||UE112 (Elliptical Undulator)|
|Energy range||4 - 200 eV|
|Energy resolution||< 1 meV for E < 100 eV|
|Flux||>1013 (photons/s/0.1%bw/100 mA)|
|Polarisation||• linear any angle|
|Divergence horizontal||1 mrad|
|Divergence vertical||3 mrad|
|Focus size (hor. x vert.)||250µm x variable (typically ~40µm)|
|User endstation||not possible|
|Distance Focus/last valve||814 mm|
|Height Focus/floor level||1757 mm|
|Phone||+49 30 8062 14696|
Flux and bandwidth with various gratings
The monochromated beam branches into two lines to serve the 12 (left) and 13 (right) setups. The latter has a focus of 250 µm.
For more details and current status contact the Instrument Scientist.