Zero Electron Kinetic Energy/Velocity Map Imaging (ZEKE/VMI) Spectroscopy of Negative Ions

摘要

Construction of the slow photoelectron, velocity-map imaging (SEVI) instrument was completed and the first results were obtained, demonstrating the power of the technique in measuring high-resolution (approx. 0.5 meV) photodetachment spectra of negative ions. Work is continuing on improving the performance of this instrument, with particular focus on reducing stray magnetic fields in the detection region and modifying the ion source and mass spectrometer to achieve higher ion signal and stability.