UE112_PGM-2b-1^3

UE112_PGM-2b-1^3

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)

Optical layout of the beam-line (top view)


Station data
Temperature range 1 - 50 K
Pressure range For details contact the Instrument Scientist.
More details ARPES One-Cube
Beamline data
Segment H13
Location (Pillar) 14.2
Source UE112 (Elliptical Undulator)
Monochromator PGM 2
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
• circular
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
Beam availability 12h/d
Phone +49 30 8062 14696
Flux and bandwidth with various gratings

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.