Ultrahigh resolution soft x-ray emission spectrometer at BL07LSU in SPring-8

Yoshihisa Harada; Masaki Kobayashi; Hideharu Niwa; Yasunori Senba; Haruhiko Ohashi; Takashi Tokushima; Yuka Horikawa; Shik Shin; Masaharu Oshima

doi:10.1063/1.3680559

Ultrahigh resolution soft x-ray emission spectrometer at BL07LSU in SPring-8

Rev Sci Instrum. 2012 Jan;83(1):013116. doi: 10.1063/1.3680559.

Authors

Yoshihisa Harada¹, Masaki Kobayashi, Hideharu Niwa, Yasunori Senba, Haruhiko Ohashi, Takashi Tokushima, Yuka Horikawa, Shik Shin, Masaharu Oshima

Affiliation

¹ Department of Applied Chemistry, Graduate School of Engineering, The University of Tokyo, Bunkyo, Tokyo, Japan. yharada@sr.t.u-tokyo.ac.jp

PMID: 22299938
DOI: 10.1063/1.3680559

Abstract

An extremely high resolution flat field type slit less soft x-ray emission spectrometer has been designed and constructed for the long undulator beamline BL07LSU in SPring-8. By optimizing the ruling parameters of two cylindrical gratings, a high energy resolution ΔE < 100 meV and/or an E∕ΔE ~ 10 000 are expected for the energy range of 350 eV - 750 eV taking into account the broadening by the spatial resolution (25 μm) of a CCD detector. A coma-free operation mode proposed by Strocov et al., is also applied to eliminate both defocus and coma aberrations. The spectrometer demonstrated experimentally that E/ΔE = 10 050 and 8046 for N 1s (402.1 eV) and Mn 2p (641.8 eV) edges, respectively.