The working principle, the layout and the performance data of a simple Rowland circle soft x-ray monochromator of constant length are described. By translating the grating while scanning the photon energy, defocus, coma and some spherical aberrations vanish, yielding excellent resolution in the optimized energy range between 270 and 590 eV. This result is obtained while using all optical elements at full illumination. The achieved resolution ranks among the best worldwide.
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Schwarzkopf et al. (1998) studied this question.
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