BL25SU Two-dimensional Display-type Angle-resolved Photoelectron Analyzer (2D-PES)
Inquiry number
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.
Energy range | 200 ~ 1000 eV |
Energy resolution | 0.25 eV |
Acceptance angle | ± 60 deg |
Angular resolution | 0.6 deg |
Spot size | 0.4 mm |
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
- H. Daimon, Phys. Rev. Lett. 86, 2034 (2001).