Spectroscopy and Crystal-Field Analysis of Low -Symmetry Er$^{3+}$ Centres in K$_2$YF$_5$ Microparticles
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| Format: | Preprint |
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2024
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| author | Solanki, Pratik S. Reid, Michael F. Wells, Jon-Paul R. |
| author_facet | Solanki, Pratik S. Reid, Michael F. Wells, Jon-Paul R. |
| contents | K$_2$YF$_5$ crystals doped with lanthanide ions have a variety of possible optical applications. Owing to the low symmetry of the system, the crystal structure cannot be unambiguously determined by x-ray diffraction. However, electron-paramagnetic resonance studies have demonstrated that lanthanide ions substitute for yttrium in sites of C$_{\rm s}$ local symmetry. In this work, we use high-resolution absorption and laser spectroscopy to determine electronic energy levels for Er$^{3+}$ ions in K$_2$YF$_5$ microparticles. A total of 39 crystal-field energy levels, distributed among 7 multiplets of the Er$^{3+}$ ion, have been assigned. This optical data is used for crystal-field modelling of the electronic structure of Er$^{3+}$ in K$_2$YF$_5$. Our model is fitted not only to the electronic energy levels, but also to the ground-state g-tensor. This magnetic-splitting data defines the axis system of the calculation, avoiding ambiguities associated with low-symmetry crystal-field fits. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2409_15630 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Spectroscopy and Crystal-Field Analysis of Low -Symmetry Er$^{3+}$ Centres in K$_2$YF$_5$ Microparticles Solanki, Pratik S. Reid, Michael F. Wells, Jon-Paul R. Materials Science Quantum Physics K$_2$YF$_5$ crystals doped with lanthanide ions have a variety of possible optical applications. Owing to the low symmetry of the system, the crystal structure cannot be unambiguously determined by x-ray diffraction. However, electron-paramagnetic resonance studies have demonstrated that lanthanide ions substitute for yttrium in sites of C$_{\rm s}$ local symmetry. In this work, we use high-resolution absorption and laser spectroscopy to determine electronic energy levels for Er$^{3+}$ ions in K$_2$YF$_5$ microparticles. A total of 39 crystal-field energy levels, distributed among 7 multiplets of the Er$^{3+}$ ion, have been assigned. This optical data is used for crystal-field modelling of the electronic structure of Er$^{3+}$ in K$_2$YF$_5$. Our model is fitted not only to the electronic energy levels, but also to the ground-state g-tensor. This magnetic-splitting data defines the axis system of the calculation, avoiding ambiguities associated with low-symmetry crystal-field fits. |
| title | Spectroscopy and Crystal-Field Analysis of Low -Symmetry Er$^{3+}$ Centres in K$_2$YF$_5$ Microparticles |
| topic | Materials Science Quantum Physics |
| url | https://arxiv.org/abs/2409.15630 |