Ultrahigh resolution soft x-ray emission spectrometer at BL07LSU in SPring-8.
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.
Department of Applied Chemistry, Graduate School of Engineering, The University of Tokyo, Bunkyo, Tokyo, Japan. yharada@sr.t.u-tokyo.ac.jp
Yoshihisa
Y
Harada
Masaki
M
Kobayashi
Hideharu
H
Niwa
Yasunori
Y
Senba
Haruhiko
H
Ohashi
Takashi
T
Tokushima
Yuka
Y
Horikawa
Shik
S
Shin
Masaharu
M
Oshima