A rotatable electron spectrometer for multicoincidence experiments.

Area of Science:

• Atomic, Molecular, and Optical Physics
• Surface Science
• Quantum Chemistry

Background:

• Characterizing electron emission requires sophisticated spectroscopic tools.
• Existing spectrometers often have limitations in angular positioning and coincidence detection capabilities.
• The need for versatile setups capable of multi-particle coincidence experiments is growing.

Purpose of the Study:

• To develop and characterize a novel rotatable hemispherical spectrometer.
• To enable high-resolution electron energy and angular distribution measurements.
• To facilitate coincidence measurements between electrons and other particles (ions, photons).

Main Methods:

• Designed a rotatable hemispherical analyzer with arbitrary lens axis positioning within a 1π solid angle.
• Integrated a three-axes goniometer for precise control of electron collection angle relative to light polarization.
• Employed a delay line detector and time-to-digital converter for electron impact position detection, replacing conventional CCD cameras.

Main Results:

• Achieved good energy and angular resolution for electron spectroscopy.
• Demonstrated the capability for positioning the spectrometer lens axis flexibly.
• Verified the design's suitability for multi-particle coincidence experiments by optimizing resolving power and acceptance angle.

Conclusions:

• The developed rotatable hemispherical spectrometer is a versatile tool for advanced electron spectroscopy.
• Its design facilitates complex coincidence experiments, crucial for detailed investigations of atomic and molecular processes.
• The use of a delay line detector offers an alternative to CCD cameras for precise electron event localization.