大型放射光施設 SPring-8

問い合わせ番号

INS-0000000280

  A display-type spherical mirror analyzer is employed at this station to study atomic- and spin- arrangements, electronic structure on surfaces. A schematic view of the analyzer is shown in the following image. An advantage of this analyzer is that the emitted photoelectrons from sample (S) converge to a focal point (A) keeping their emission angles. The electrons through an apature is projected on the screen. Hence we can measure angle-resolved intensity distribution of the photoelectrons at a given kinetic energy. The acceptance solid angle is ± 60°. The energy resolution of this analyzer is 0.2% of pass energies. Photoemission diffraction patterns measured using left and right circularly polarized lights provide stereo-photographs of atomic arrangements. In addition, the photoelectron (Auger electron) diffraction pattern can be regarded as a hologram. It is possible to reconstruct the three-dimensional atomic structure from the hologram.

A schematic view of display-type spherical mirror analyzer

• Typical data of stereograph of atomic arrangement. (Tungsten crystal)
  

  Stereo-photographs of atomic structure in tungsten crystal

References

1. H. Daimon, Phys. Rev. Lett. 86, 2034 (2001).