What question did this study set out to answer?

The research aims to optimize the mechanical aspects of the TR-XPES setup to enhance its performance for femtosecond spectroscopy experiments.

April 4, 2026Open Access

Mechanical Optimization of the TR-XPES station of the SXP Instrument at the European XFEL

Key Points

The research aims to optimize the mechanical aspects of the TR-XPES setup to enhance its performance for femtosecond spectroscopy experiments.
Conducted mechanical optimizations of the TR-XPES setup to enhance stability and precision.
Integrated Pump-Probe Laser (PPL) for collinear propagation with FEL into the experimental chamber.
Ensured compatibility of laser pulses with the FEL beam across multiple wavelengths.
Improved mechanical stability of the TR-XPES setup leading to enhanced experimental reliability.
Achieved precise alignment of laser and FEL beams for better excitation of solid state samples.

Abstract

The TR-XPES (Time Resolved X-Ray Photoelectron Spectroscopy) setup is the first experimental station integrated at the Soft X-ray Port (SXP) instrument of the European XFEL. It has been developed to perform femtosecond time resolved photoelectron spectroscopy experiments on solid state samples in the soft X-ray photon energy range from 0.25 keV to 3 keV, generated by the SASE3 undulator system. A Pump-Probe Laser (PPL) colinearly propagating with the FEL into the experimental chamber is used to excite the samples. The laser pulses have the same time structure as the FEL beam for the two fundamental output wavelengths, 800 nm and 1030 nm, as well as for the second and third harmonics. Other wavelengths up to 15 microns can be generated with an Optical Parametric Amplifier (OPA) at reduced repetition rate. In this contribution, a mechanical optimization of the TR-XPES setup is presented.

Mechanical Optimization of the TR-XPES station of the SXP Instrument at the European XFEL

Key Points

Abstract

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