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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
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2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2507.18839 |
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| _version_ | 1866908465478238208 |
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| author | Abramson, Jared E. Cardot, Charles A. Kas, Josh J. Rehr, John J. Kaminsky, Werner Michor, Herwig Roman, Marta Becker, Petra Seidler, Gerald T. |
| author_facet | Abramson, Jared E. Cardot, Charles A. Kas, Josh J. Rehr, John J. Kaminsky, Werner Michor, Herwig Roman, Marta Becker, Petra Seidler, Gerald T. |
| contents | Polarization dependence has historically seen extensive use in x-ray spectroscopy to determine magnetic and local geometric properties, but more broadly as a way to gain extra sensitivity to electronic structure at the level of individual magnetic orbitals. This is often done in the context of x-ray absorption through techniques like x-ray magnetic circular dichroism or x-ray linear dichroism, but it has seen little application to x-ray emission. Here we explore the information contained in the polarized emission of two 3d transition metal systems across both core-to-core (CtC) and valence-to-core emission (VtC) lines. We demonstrate how the Rowland circle geometry can be used as a spectropolarimeter, and apply it to the x-ray emission spectroscopy of spin-1/2 Cu(II) and spin-0 Ni(II) ions in LiVCuO4 and DyNiC2, respectively. From this we explore how the polarized XES interrogates of the occupied density of states at the valence level, either as a second order effect through Coulomb exchange (CtC x-ray emission) or by direct transitions (VtC x-ray emission). We find that the polarized x-ray emission can provide insights into the valence electron orbital occupation, in much the same way that is achievable with polarized absorption or angle-resolved photoemission spectroscopy techniques. Finally, we highlight how the individually polarized dipole emission spectra can be extracted from a linearly independent suite of directed emission spectra, allowing for polarized measurements at high Bragg angle with lower experimental broadening. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_18839 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | X-ray Emission Spectropolarimetry of Strongly Anisotropic Single Crystal Systems using a Rowland Circle Geometry Abramson, Jared E. Cardot, Charles A. Kas, Josh J. Rehr, John J. Kaminsky, Werner Michor, Herwig Roman, Marta Becker, Petra Seidler, Gerald T. Strongly Correlated Electrons Chemical Physics Polarization dependence has historically seen extensive use in x-ray spectroscopy to determine magnetic and local geometric properties, but more broadly as a way to gain extra sensitivity to electronic structure at the level of individual magnetic orbitals. This is often done in the context of x-ray absorption through techniques like x-ray magnetic circular dichroism or x-ray linear dichroism, but it has seen little application to x-ray emission. Here we explore the information contained in the polarized emission of two 3d transition metal systems across both core-to-core (CtC) and valence-to-core emission (VtC) lines. We demonstrate how the Rowland circle geometry can be used as a spectropolarimeter, and apply it to the x-ray emission spectroscopy of spin-1/2 Cu(II) and spin-0 Ni(II) ions in LiVCuO4 and DyNiC2, respectively. From this we explore how the polarized XES interrogates of the occupied density of states at the valence level, either as a second order effect through Coulomb exchange (CtC x-ray emission) or by direct transitions (VtC x-ray emission). We find that the polarized x-ray emission can provide insights into the valence electron orbital occupation, in much the same way that is achievable with polarized absorption or angle-resolved photoemission spectroscopy techniques. Finally, we highlight how the individually polarized dipole emission spectra can be extracted from a linearly independent suite of directed emission spectra, allowing for polarized measurements at high Bragg angle with lower experimental broadening. |
| title | X-ray Emission Spectropolarimetry of Strongly Anisotropic Single Crystal Systems using a Rowland Circle Geometry |
| topic | Strongly Correlated Electrons Chemical Physics |
| url | https://arxiv.org/abs/2507.18839 |