Conduction band electronic structure of metallic beryllium

We have measured the bulk energy-momentum-resolved density of the conduction band of metallic beryllium by means of electron momentum spectroscopy. From the data we have determined the band dispersion, occupied bandwidth, electron momentum density and density of states. The experimental results are compared with theoretical band-structure calculations performed within the full-potential linear muffin-tin orbital (FP-LMTO) approximation. There is good agreement between experiment and theory for the shape and intensity of the conduction band provided multiple-scattering and hole lifetime effects are included. The measured occupied bandwidth is 11.15 ± 0.15 eV, which is larger than that predicted by our LMTO calculation, but agrees well with previous experimental and theoretical data. The experiment also reveals that the band dispersion is narrower in momentum compared to theory, the difference reaching as much as 0.15 au near the free-electron Fermi momentum

Electronic Band Structure of Beryllium Oxide

Atomic and Molecular Physics Laboratories, Research School of Physical Sciences and Engineering, The Australian National University, Canberra ACT 0200, Australia. The energy-momentum resolved valence band structure of beryllium oxide has been measured b

Electronic Band Structure of Calcium Oxide

We employed electron momentum spectroscopy (EMS) to measure the bulk electronic structure of calcium oxide. We extracted the electron momentum density (EMD), density of occupied states (DOS), band dispersions, bandwidths and intervalence bandgaps from the data. The results are compared with calculations based on the full potential linear muffin-tin orbital(FP-LMTO) approximation. While the bandwidths of 0.6±0.2 and 1.2±0.1 eV for the s- and p-bands, respectively, and their dispersions agree well with the LMTO calculation, the relative intensity of the two bands is at odds with the theory. The measured intervalence bandgap at the Γ-point of 16.5±0.2 eV is larger by 2.1 eV than that from the LMTO calculation. The experimental bandwidth of the Ca 3p semi-core level of 0.7±0.1 eV agrees with the LMTO prediction. The measured bandgap between this level and the s-band is 3.6±0.2 eV. The Ca 3s-3p level splitting is in excellent agreement with the literature

Differential and integral cross sections for elastic electron scattering from CF2

We report the results of measurements and calculations of differential and integral cross sections for elastic electron scattering from the CF2 molecular radical. The energy range of the present investigation was 2°-20 eV, while the angular distribution