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Figure 2
(a) Scheme of the grating beam path with mirrors of the variable-delay beam path (gray), grating beam path (black) and both fixed delay beam paths (Ni-coated mirrors: orange; Pt-coated mirrors: blue). (b) Top view of the grating beam path. The cylindrical mirror CM1 focuses the beam onto the slit S. The grating G1 is chosen in a Hettrick geometry to CM1, diffracts the beam and forms a focus at the slit S. The grating G2 and cylindrical mirror CM2 form a reversed Hettrick monochromator, thereby compensating the dispersion introduced by the first set-up. The orange mirrors represent the standard Ni-coated beam path. It can be chosen by moving the co-mounted CM1 and CM2 mirrors vertically. The blue mirrors represent the beam path via Pt-coated mirrors for photon energies from hν = 800 eV to hν = 1800 eV which is not affected by the monochromator. |