FinEstBeAMS Attributes

TechniquesX-ray Photoelectron Spectroscopy (XPS), X-ray Absorption Spectroscopy (XAS), Photoelectron Photoion Coincidence Spectroscopy (PEPICO), Time-of Flight Mass Spectroscopy (TOF), Photoluminescence Spectroscopy (PS)
Beam Size0.1 (V) x 0.1 (H) mm, best: 0.02 (V) x 0.1 (H) mm, possible to use defocused beam
Energy Range4.3 - 1000 eV (288 - 1.24 nm), 1486 eV (0.83 nm) reachable when EPU is used as wiggler
Time Scalesnanoseconds to seconds
SamplesAtomis, Molecules, Clusters, Gases, Liquids, Atmospheric particles, Nanoparticles, Solids

Capabilities available for users
The radiation source is an elliptically polarizing undulator. It can provide radiation with different polarization properties: linearly polarized (horizontal, vertical, or inclined direction) and circularly polarized. Only linear horizontal polarization has been extensively tested.

The photon energy range extends from 4.4 eV to about 1400 eV and is covered by two gratings. A 92 lines/mm grating (G2) can be used from 4.4 eV to 50 eV, while the 600 lines/mm grating works above 15 eV. However, the photon flux decreases considerably toward high photon energies. The actually usable photon energy range depends on the nature of particular experiments.

The beamline has achieved a resolving power of about 9000 at 400 eV photon energy using the exit slit of ~12 mm in the monochromator.

Two end stations are operational: Gas-phase end station (GPES) and Photoluminescence end station (FinEstLUMI).

The GPES has been designed to detect coincidences between energy resolved electrons and positive ions (PEPICO), but single electron and ion time-of-flight spectra can of course be measured. All these operation modes have been verified to work.

FinEstLUMI can be used to measure fluorescence emission from different kinds of solids in the infra-red, visible and ultraviolet spectral ranges. The excitation functions of these emissions can be determined by scanning the incident photon energy.

The solid state end station is not yet available.

Further information about the end stations can be found under submenu “Experimental stations”.