Ponente
Descripción
We propose a novel RF Timer based photoelectron emission spectrometer designed for the study of the energy and temporal characteristics of very low energy photoelectrons. In the near threshold regime, emitted electrons have kinetic energies from a few meV to several hundred meV, making their distributions highly sensitive to the work function, surface condition, electronic states near the Fermi level and defect related modifications of the material. The instrument combines very low photon energy photoelectron spectroscopy with RF Timer based electron timing, enabling measurement of photoelectron energy and photoelectron emission time characteristics in the picosecond regime.
A particularly relevant application is the characterization of neutron irradiated materials in the context of IFMIF-DONES and future fusion material qualification programs. Radiation induced vacancies, interstitials, defect clusters and surface modifications can alter the density of states, work function, carrier transport and low energy electron emission properties. By measuring both the low energy photoelectron spectrum and emission time distribution, the proposed instrument could provide complementary information on defect related electron dynamics and radiation damage.