Photoemission Spectroscopy and Photoemission Electron Microscopy Beamline at the Siam Photon Laboratory

A beamline to utilize radiation from the first undulator at the Siam Photon Laboratory was designed and constructed. The beamline employs a varied line-spacing plane grating monochromator with three interchangeable gratings, which provides energy between 40-160 and 220-1040 eV. There are two optical branches downstream of the monochromator allowing two different measurement techniques, i.e. photoemission spectroscopy and photoemission electron microscopy, to be utilized in a time-sharing mode. In this report, the detailed descriptions of the beamline as well as the performance of the beamline and the commissioning results will be presented. Problems found during the undulator commissioning will also be discussed.