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@ARTICLE{Sundermann:633257,
      author       = {Sundermann, Martin and Harder, Manuel and Said, Ayman H.
                      and Keimer, Bernhard and Gretarsson, Hlynur},
      title        = {{D}ispersion-compensated {R}owland spectrometer:
                      implications for uranium {VB}-{RIXS}},
      journal      = {Journal of synchrotron radiation},
      volume       = {33},
      number       = {1},
      issn         = {0909-0495},
      address      = {Chester},
      publisher    = {IUCr},
      reportid     = {PUBDB-2025-02383},
      pages        = {218 - 226},
      year         = {2026},
      abstract     = {The total energy resolution (ΔE$_{tot}$) of a valence-band
                      resonant inelastic X-ray scattering (VB-RIXS) instrument
                      serves as an important point of reference in an otherwise
                      complex field. Since VB-RIXS is a flux-limited technique, a
                      pragmatic approach to reducing ΔE$_{tot}$ is often
                      required—the specifications of a spectrometer should be
                      matched with a comparable incident bandwidth (ΔE$_i$) and
                      the source size contribution (focal point) should be
                      negligible. Although it advocates for a good efficiency,
                      this approach is in many places already limited by
                      count-rates. Here we follow a recent trend emerging in soft
                      X-ray VB-RIXS and look at the performance of our tender
                      X-ray Rowland spectrometer (Gretarsson et al., 2020) when
                      being exposed to a source with a large linear dispersion
                      (higher flux). Detailed ray tracing work, performed at the U
                      M5-edge (3551 eV), finds that the intrinsic resolution of
                      the Rowland spectrometer (ΔE$_a$) can be obtained if the
                      linear dispersion of the source matches the spectrometer's,
                      but opposite in sign—here ΔE$_i$ does not matter. This
                      finding is supported by experimental data where ΔE$_{tot}$
                      = 48 meV (ΔE$_a$ = 44 meV) was recently achieved.
                      Furthermore, we demonstrate that the dispersion rate can be
                      tuned, ensuring the method's applicability to other atomic
                      edges.},
      cin          = {FS-PETRA-S},
      ddc          = {550},
      cid          = {I:(DE-H253)FS-PETRA-S-20210408},
      pnm          = {632 - Materials – Quantum, Complex and Functional
                      Materials (POF4-632) / 6G3 - PETRA III (DESY) (POF4-6G3)},
      pid          = {G:(DE-HGF)POF4-632 / G:(DE-HGF)POF4-6G3},
      experiment   = {EXP:(DE-H253)P-P01-20150101},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.1107/S1600577525010318},
      url          = {https://bib-pubdb1.desy.de/record/633257},
}