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Title: A compact approach to higher-resolution resonant inelastic x-ray scattering detection using photoelectrons

Journal Article · · New Journal of Physics
ORCiD logo [1];  [2]; ORCiD logo [3];  [4]; ORCiD logo [2]; ORCiD logo [5];  [5]; ORCiD logo [5];  [6];  [7];  [5];  [8]; ORCiD logo [2]; ORCiD logo [3]
  1. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany); Univ. of Hamburg (Germany); SLAC
  2. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany); Christian-Albrechts-Universität zu Kiel (Germany)
  3. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany); Univ. of Hamburg (Germany); Stockholm Univ. (Sweden)
  4. Univ. of Hamburg (Germany)
  5. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
  6. Ecole Polytechnique Federale Lausanne (EPFL) (Switzerland)
  7. SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
  8. Christian-Albrechts-Universität zu Kiel (Germany)

The detection of inelastically scattered soft x-rays with high energy resolution usually requires large grating spectrometers. Recently, photoelectron spectrometry for analysis of x-rays (PAX) has been rediscovered for modern spectroscopy experiments at synchrotron light sources. By converting scattered photons to electrons and using an electron energy analyser, the energy resolution for resonant inelastic x-ray scattering (RIXS) becomes decoupled from the x-ray spot size and instrument length. In this work, we develop PAX towards high energy resolution using a modern photoemission spectroscopy setup studying Ba2Cu3O4Cl2 at the Cu L3-edge. We measure a momentum transfer range of 24% of the first Brillouin zone simultaneously. Our results hint at the observation of a magnon excitation below 100 meV energy transfer and show intensity variations related to the dispersion of dd-excitations. With dedicated setups, PAX can complement the best and largest RIXS instruments, while at the same time opening new opportunities to acquire RIXS at a range of momentum transfers simultaneously and combine it with angle-resolved photoemission spectroscopy in a single instrument.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC); Helmholtz Association of German Research Centres
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
2396965
Journal Information:
New Journal of Physics, Journal Name: New Journal of Physics Journal Issue: 5 Vol. 26; ISSN 1367-2630
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

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