Monochromatized Electron Source

A new electron source for the parallel acquisition of high-resolution electron energy loss spectra.

Investigating the dispersion of phonons and collective charge modes with high surface sensitivity is best achieved with high-resolution electron energy loss spectroscopy (HREELS) [1]. However, a systematic measurement over the whole Brillouin zone can takes weeks with standard instruments, which measure the electron intensity sequentially, i.e., at one specific loss energy and one scattering angle at a time. Therefore, we have modified a high-resolution electron source to meet the requirements of commercial hemispherical electron analysers with E(k) imaging capabilities [2, 3]. This allows the parallel detection of electrons in a broad range of momenta. Our electron source has been licensed to ScientaOmicron and is commercially available as MCES150.