Measurement of the polarization for soft x-ray magnetic circular   dichroism at the BSRF beamline 4B7B
  Three ultra-short-period W/B4C multilayers (1.244nm, 1.235nm and 1.034nm) have been fabricated and used for polarization measurement at the 4B7B Beamline of Beijing Synchrotron Radiation Facility (BSRF). By rotating analyzer ellipsometry method, the linear polarization degree of light emerging from this beamline has been measured and the circular polarization evaluated for 700eV-860eV. The first soft x-ray magnetic circular dichroism measurements are carried out at BSRF by positioning the beamline aperture out of the plane of the electron storage ring. 
Guo Zhi-Ying, Xi Shi-Bo, Zhu Jing-Tao, Zhao YI-Dong, Zheng Lei, Hong   Cai-Hao, Tang Kun, Yang Dong-Liang, Cui Ming-Qi
physics.optics