Plane-grating monochromator at BESSY II using collimated light.

Area of Science:

• Synchrotron Radiation Science
• Spectroscopy
• Materials Science

Background:

• The German synchrotron facility BESSY II utilizes the U125 undulator to cover the vacuum ultraviolet (VUV) photon energy range.
• Existing beamlines require optimization for flexible experimental setups.

Purpose of the Study:

• To characterize and optimize a plane-grating monochromator (PGM) beamline at BESSY II.
• To demonstrate the flexible operation of the PGM for various experimental requirements.

Main Methods:

• Utilized the first, third, and fifth harmonics of the U125 undulator for VUV photon generation (15-600 eV).
• Employed a plane-grating monochromator (PGM) with a variable deviation angle.
• Operated the PGM using collimated radiation and software control for mode selection.

Main Results:

• The PGM beamline successfully covers the 15-600 eV VUV photon energy range.
• Flexible operation modes were achieved, including high spectral resolution, high-order suppression, and high-flux mode.
• Software control allows for easy switching between operational modes based on user demands.

Conclusions:

• The optimized PGM beamline at BESSY II provides a highly flexible VUV radiation source.
• This enhanced capability supports a wider range of experiments in synchrotron radiation research.
• The adaptable nature of the beamline improves user efficiency and experimental outcomes.