ToF-PAX-RIXS: A Time-of-Flight Spectrometer for combined ARPES and RIXS
Abstract
We present ToF-PAX-RIXS, a compact instrument that combines time-of-flight momentum-microscopy angle-resolved photoemission spectroscopy (ARPES) with resonant inelastic X-ray scattering (RIXS). The latter is based on photoelectron spectrometry for analysis of X-rays (PAX). The two techniques are implemented with a single multimode electron-optical column, allowing measurements to be performed sequentially on the same sample under identical experimental conditions. In ARPES mode, the instrument records the photoemission intensity as a function of kinetic energy and two in-plane momentum components. In PAX-RIXS mode, scattered soft X-ray photons are absorbed in a thin metallic converter, and the generated photoelectrons are analyzed in energy and position of emission on the converter. The electron kinetic energy retains the spectral information of the scattered photons, while the position is related to the scattering angle and therefore to the momentum transfer, enabling simultaneous access to a finite momentum-transfer interval. We describe the mechanical design, converter assembly, scattering geometry, and multimode electron optics of the instrument. Its PAX-RIXS performance is benchmarked at the Cu L3 edge using CaCuO2, with Au, Ag, and Pt converters. The measured spectra reproduce the principal features obtained with a conventional grating RIXS spectrometer, and deconvolution yields an effective reconstructed energy resolution better than $120$~meV under the present conditions. Finally, combined ARPES and PAX-RIXS measurements on the same Ca-doped YBa2Cu3O6.45 sample demonstrate the capability of the instrument to correlate electronic structure and collective excitations within a common compact platform.
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BibTeX
@misc{fawaz2026tofpaxrixs,
title = {{ToF-PAX-RIXS: A Time-of-Flight Spectrometer for combined ARPES and RIXS}},
author = {Chafic Fawaz and Tom Lacmannn and Yaryna Lytvynenko and Sergii Chernov and Olena Tkach and Siegmar Roth and Jan O. Schunck and Amon Lanz and Jakob Dilling and Lukas Bruckmeier and Markus Scholz and Frank Scholz and Arne Meyer and Dirk Fuchs and Lara Schmieder and Yiran Liu and Matteo Minola and Bernhard Keimer and Dmytro Kutnyakhov and Kai Rossnagel and Olena Fedchenko and Angela Wittmann and Moritz Hoesch and Gerd Schönhense and Matthieu Le Tacon and Hans-Joachim Elmers and Martin Beye},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.03993},
eprint = {2610.03993},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.03993},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - ToF-PAX-RIXS: A Time-of-Flight Spectrometer for combined ARPES and RIXS
AU - Chafic Fawaz
AU - Tom Lacmannn
AU - Yaryna Lytvynenko
AU - Sergii Chernov
AU - Olena Tkach
AU - Siegmar Roth
AU - Jan O. Schunck
AU - Amon Lanz
AU - Jakob Dilling
AU - Lukas Bruckmeier
AU - Markus Scholz
AU - Frank Scholz
AU - Arne Meyer
AU - Dirk Fuchs
AU - Lara Schmieder
AU - Yiran Liu
AU - Matteo Minola
AU - Bernhard Keimer
AU - Dmytro Kutnyakhov
AU - Kai Rossnagel
AU - Olena Fedchenko
AU - Angela Wittmann
AU - Moritz Hoesch
AU - Gerd Schönhense
AU - Matthieu Le Tacon
AU - Hans-Joachim Elmers
AU - Martin Beye
PY - 2026
DA - 2026/10/02
PB - arXiv
DO - 10.48550/arxiv.2610.03993
UR - https://arxiv.org/abs/2610.03993
AB - We present ToF-PAX-RIXS, a compact instrument that combines time-of-flight momentum-microscopy angle-resolved photoemission spectroscopy (ARPES) with resonant inelastic X-ray scattering (RIXS). The latter is based on photoelectron spectrometry for analysis of X-rays (PAX). The two techniques are implemented with a single multimode electron-optical column, allowing measurements to be performed sequentially on the same sample under identical experimental conditions. In ARPES mode, the instrument records the photoemission intensity as a function of kinetic energy and two in-plane momentum components. In PAX-RIXS mode, scattered soft X-ray photons are absorbed in a thin metallic converter, and the generated photoelectrons are analyzed in energy and position of emission on the converter. The electron kinetic energy retains the spectral information of the scattered photons, while the position is related to the scattering angle and therefore to the momentum transfer, enabling simultaneous access to a finite momentum-transfer interval. We describe the mechanical design, converter assembly, scattering geometry, and multimode electron optics of the instrument. Its PAX-RIXS performance is benchmarked at the Cu L_3 edge using CaCuO_2, with Au, Ag, and Pt converters. The measured spectra reproduce the principal features obtained with a conventional grating RIXS spectrometer, and deconvolution yields an effective reconstructed energy resolution better than $120$~meV under the present conditions. Finally, combined ARPES and PAX-RIXS measurements on the same Ca-doped YBa_2Cu_3O_6.45 sample demonstrate the capability of the instrument to correlate electronic structure and collective excitations within a common compact platform.
ER -