Characterization of the thorium-229 defect structure in CaF2 crystals
Recent advancements in laser excitation of the low-energy thorium-229 ( ^229 Th) nuclear isomeric state in calcium fluoride (CaF _2 ) single crystals render this system a promising candidate for a solid-state nuclear clock. Nonetheless, the precise experimental determination of the microscopic ion c...
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IOP Publishing
2025-01-01
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| Series: | New Journal of Physics |
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| Online Access: | https://doi.org/10.1088/1367-2630/adce22 |
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| author | S Takatori M Pimon S Pollitt M Bartokos K Beeks A Grüneis T Hiraki T Honma N Hosseini A Leitner T Masuda I Morawetz K Nitta K Okai T Riebner F Schaden T Schumm O Sekizawa T Sikorsky Y Takahashi L Toscani De Col R Yamamoto T Yomogida A Yoshimi K Yoshimura |
| author_facet | S Takatori M Pimon S Pollitt M Bartokos K Beeks A Grüneis T Hiraki T Honma N Hosseini A Leitner T Masuda I Morawetz K Nitta K Okai T Riebner F Schaden T Schumm O Sekizawa T Sikorsky Y Takahashi L Toscani De Col R Yamamoto T Yomogida A Yoshimi K Yoshimura |
| author_sort | S Takatori |
| collection | DOAJ |
| description | Recent advancements in laser excitation of the low-energy thorium-229 ( ^229 Th) nuclear isomeric state in calcium fluoride (CaF _2 ) single crystals render this system a promising candidate for a solid-state nuclear clock. Nonetheless, the precise experimental determination of the microscopic ion configuration surrounding the doped ^229 Th and its electronic charge state remains a critical challenge. Such characterization is essential for precisely controlling the clock transition and evaluating the performance of this solid-state nuclear clock system. In this study, we use x-ray absorption fine structure spectroscopy of ^229 Th:CaF _2 to investigate the charge state and coordination environment of doped ^229 Th. The results indicate that ^229 Th displays a 4+ oxidation state at the substitutional site of a Ca ^2+ ion, with charge compensated provided by two F ^− ions positioned at interstitial sites adjacent to ^229 Th. |
| format | Article |
| id | doaj-art-5bb2c80667c84add9bb7d1fb4c44081c |
| institution | OA Journals |
| issn | 1367-2630 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj-art-5bb2c80667c84add9bb7d1fb4c44081c2025-08-20T02:29:03ZengIOP PublishingNew Journal of Physics1367-26302025-01-0127404302410.1088/1367-2630/adce22Characterization of the thorium-229 defect structure in CaF2 crystalsS Takatori0https://orcid.org/0000-0002-8705-9624M Pimon1https://orcid.org/0000-0001-7784-463XS Pollitt2M Bartokos3https://orcid.org/0009-0004-7610-9122K Beeks4https://orcid.org/0000-0002-8707-6723A Grüneis5T Hiraki6https://orcid.org/0000-0002-6235-5830T Honma7N Hosseini8A Leitner9https://orcid.org/0009-0007-1156-1881T Masuda10https://orcid.org/0000-0001-8122-5145I Morawetz11K Nitta12K Okai13T Riebner14F Schaden15https://orcid.org/0000-0001-7154-0440T Schumm16https://orcid.org/0000-0002-1066-202XO Sekizawa17T Sikorsky18https://orcid.org/0000-0003-0280-0928Y Takahashi19https://orcid.org/0000-0001-7860-2341L Toscani De Col20R Yamamoto21T Yomogida22https://orcid.org/0000-0002-2005-0027A Yoshimi23https://orcid.org/0000-0002-2438-1384K Yoshimura24https://orcid.org/0000-0002-2415-718XResearch Institute for Interdisciplinary Science (RIIS), Okayama University , Tsushima-naka 3-1-1 Kita-ku, Okayama 700-8530, JapanFaculty of Physics, TU Wien , Vienna, AustriaFaculty of Physics, TU Wien , Vienna, AustriaFaculty of Physics, TU Wien , Vienna, AustriaFaculty of Physics, TU Wien , Vienna, Austria; Laboratory for Ultrafast Microscopy and Electron Scattering (LUMES), Institute of Physics , Ecole Polytechnique F d rale de Lausanne (EPFL), Lausanne CH-1015, SwitzerlandFaculty of Physics, TU Wien , Vienna, AustriaResearch Institute for Interdisciplinary Science (RIIS), Okayama University , Tsushima-naka 3-1-1 Kita-ku, Okayama 700-8530, JapanJapan Synchrotron Radiation Research Institute , 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, JapanFaculty of Physics, TU Wien , Vienna, AustriaFaculty of Physics, TU Wien , Vienna, AustriaResearch Institute for Interdisciplinary Science (RIIS), Okayama University , Tsushima-naka 3-1-1 Kita-ku, Okayama 700-8530, JapanFaculty of Physics, TU Wien , Vienna, AustriaJapan Synchrotron Radiation Research Institute , 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, JapanResearch Institute for Interdisciplinary Science (RIIS), Okayama University , Tsushima-naka 3-1-1 Kita-ku, Okayama 700-8530, JapanFaculty of Physics, TU Wien , Vienna, AustriaFaculty of Physics, TU Wien , Vienna, AustriaFaculty of Physics, TU Wien , Vienna, AustriaJapan Synchrotron Radiation Research Institute , 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, JapanFaculty of Physics, TU Wien , Vienna, AustriaDepartment of Earth and Planetary Science, The University of Tokyo , Bunkyo-ku, Tokyo 113-0033, JapanFaculty of Physics, TU Wien , Vienna, AustriaResearch Institute for Interdisciplinary Science (RIIS), Okayama University , Tsushima-naka 3-1-1 Kita-ku, Okayama 700-8530, JapanDepartment of Earth and Planetary Science, The University of Tokyo , Bunkyo-ku, Tokyo 113-0033, Japan; Nucleaer Safety Research Center, Japan Atomic Energy Agency , 2-4 Shirakata, Tokai-mura, Naka-gun, Ibaraki 319-1195, JapanResearch Institute for Interdisciplinary Science (RIIS), Okayama University , Tsushima-naka 3-1-1 Kita-ku, Okayama 700-8530, JapanResearch Institute for Interdisciplinary Science (RIIS), Okayama University , Tsushima-naka 3-1-1 Kita-ku, Okayama 700-8530, JapanRecent advancements in laser excitation of the low-energy thorium-229 ( ^229 Th) nuclear isomeric state in calcium fluoride (CaF _2 ) single crystals render this system a promising candidate for a solid-state nuclear clock. Nonetheless, the precise experimental determination of the microscopic ion configuration surrounding the doped ^229 Th and its electronic charge state remains a critical challenge. Such characterization is essential for precisely controlling the clock transition and evaluating the performance of this solid-state nuclear clock system. In this study, we use x-ray absorption fine structure spectroscopy of ^229 Th:CaF _2 to investigate the charge state and coordination environment of doped ^229 Th. The results indicate that ^229 Th displays a 4+ oxidation state at the substitutional site of a Ca ^2+ ion, with charge compensated provided by two F ^− ions positioned at interstitial sites adjacent to ^229 Th.https://doi.org/10.1088/1367-2630/adce22solid-state nuclear clockthorium-229XAFS |
| spellingShingle | S Takatori M Pimon S Pollitt M Bartokos K Beeks A Grüneis T Hiraki T Honma N Hosseini A Leitner T Masuda I Morawetz K Nitta K Okai T Riebner F Schaden T Schumm O Sekizawa T Sikorsky Y Takahashi L Toscani De Col R Yamamoto T Yomogida A Yoshimi K Yoshimura Characterization of the thorium-229 defect structure in CaF2 crystals New Journal of Physics solid-state nuclear clock thorium-229 XAFS |
| title | Characterization of the thorium-229 defect structure in CaF2 crystals |
| title_full | Characterization of the thorium-229 defect structure in CaF2 crystals |
| title_fullStr | Characterization of the thorium-229 defect structure in CaF2 crystals |
| title_full_unstemmed | Characterization of the thorium-229 defect structure in CaF2 crystals |
| title_short | Characterization of the thorium-229 defect structure in CaF2 crystals |
| title_sort | characterization of the thorium 229 defect structure in caf2 crystals |
| topic | solid-state nuclear clock thorium-229 XAFS |
| url | https://doi.org/10.1088/1367-2630/adce22 |
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