Development of TEM-SXES instruments for valence electron spectroscopy

Electron energy-loss spectroscopy in the TEM

Electron energy-loss spectroscopy (EELS) is an analytical technique that measures the change in kinetic energy of electrons after they have interacted with a specimen. When carried out in a modern transmission electron microscope, EELS is capable of giving structural and chemical information about a solid, with a spatial resolution down to the atomic level in favourable cases. The energy resolu...

Present State of TEM-SXES Analysis and its Application to SEM aiming Chemical Analysis of Bulk Materials

X-ray emission spectroscopy is widely used as a practical tool for compositional analysis of local specimen area and elemental mapping analysis in electron microscopes. X-rays with energy more than a few keV are dominantly due to electronic transitions between inner-shell electron levels. Those characteristic X-ray energies are useful for assignment of elements. On the other hand, X-rays origin...

Investigation of valence orbitals of propene by electron momentum spectroscopy.

The binding energy spectra and momentum distributions of all valence orbitals of propene were studied by electron momentum spectroscopy (EMS) as well as Hartree-Fock and density functional theoretical calculations. The experiment was carried out at impact energies of 1200 eV and 600 eV on the state-of-the-art EMS spectrometer developed at Tsinghua University recently. The experimental momentum ...

Gas-phase valence-electron photoemission spectroscopy using density functional theory.

We present a tutorial overview of the simulation of gas-phase valence-electron photoemission spectra using density functional theory (DFT), emphasizing both fundamental considerations and practical applications, and making appropriate links between the two. We explain how an elementary quantum mechanics view of photoemission couples naturally to a many-body perturbation theory view. We discuss ...

Imaging electron detectors for low-voltage TEM