High-resolution electron time-of-flight spectrometers for angle-resolved measurements at the SQS Instrument at the...

Area of Science:

• Atomic, Molecular, and Optical (AMO) Physics
• X-ray Science
• Spectroscopy

Background:

• High-resolution spectroscopy is crucial for understanding quantum systems.
• Existing instruments faced limitations in resolving power and energy bandwidth.
• The Small Quantum Systems (SQS) instrument at European XFEL required advanced spectrometers.

Purpose of the Study:

• To develop and demonstrate a novel electron time-of-flight spectrometer for high-resolution angle-resolved spectroscopy.
• To achieve a resolving power exceeding 10,000 (E/ΔE).
• To enable detailed studies of gaseous samples at the Atomic-like Quantum Systems endstation.

Main Methods:

• Development of a set of electron time-of-flight spectrometers.
• Testing the spectrometer design using the Ne 1s⁻¹3p resonant Auger spectrum.
• Characterization of spectral width at the European XFEL.

Main Results:

• Demonstrated resolving power greater than 10,000 (E/ΔE) at a synchrotron source.
• Achieved a spectral width of approximately 0.5 eV (FWHM) at 800 eV kinetic energy at the European XFEL.
• Expected consistent performance over a broad kinetic energy range.

Conclusions:

• The developed spectrometers meet the demands for high-resolution angle-resolved spectroscopy at the European XFEL.
• The instrument array is optimized for detailed spectroscopic analysis of gaseous samples.
• This advancement significantly enhances the study of atomic-like quantum systems.