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A novel analysis system of synchrotron-orbital-radiation-light induced photoemission coupled with ion scattering: SORI

Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms
Publication Date
DOI: 10.1016/s0168-583x(97)00819-7
  • X. Novel Ion Beam Techniques
  • Design
  • Physics


Abstract We designed and constructed a novel analysis beam line connected to a 575 MeV electron synchrotron with a super-conducting magnet working at the Ritsumeikan University. It allows synchrotron-orbital-light induced photoemission and medium energy ion scattering spectroscopy under ultrahigh vacuum conditions and thus enables us to determine the electronic states and atomic configurations of surfaces and interfaces for various materials. Samples are prepared by molecular beam epitaxy and can be analyzed in situ by the above spectroscopy without exposing them to the air. The optical system consists of a cylindrical mirror for collection of the synchrotron radiation-light, a couple of plane mirrors for deflection and a varied-space plane grating as a monochromator and a toroidal mirror for focusing the monochromated light on a sample. Exchange of the varied-space plane grating monochromators of different line densities covers the photon energies from 5 up to 700 eV and the resolution ( ΔE E ) is estimated to be better than 6 × 10 −4. Photoelectrons are detected with a hemispherical energy analyzer with a radius of 139.7 mm. A new toroidal electrostatic analyzer was designed and fabricated to realize a layer-by-layer analysis using medium energy ion scattering. A wide interelectrode distance of 18 mm covers a wide energy range, W( = 0.1 × E 0, where E 0 is the energy of ions deflected along a central curvature) at a fixed applied voltage and thus reduces the acquisition time without lowering the statistics. This paper represents the preliminary data obtained so far concerning surface hydrogen detection and surface relaxation of TiO 2-terminated SrTiO 3 (0 0 1).

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