Study of the elusive $5s-4f$ level crossing in highly charged osmium with optical transitions suitable for physics beyond the Standard Model searches
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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866911142881787904 |
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| author | Rehbehn, Nils-Holger Sajith, Lakshmi Priya Kozhiparambil Rosner, Michael K. Cheung, Charles Porsev, Sergey G. Safronova, Marianna S. Worm, Steven Budker, Dmitry Pfeifer, Thomas López-Urrutia, José R. Crespo Bekker, Hendrik |
| author_facet | Rehbehn, Nils-Holger Sajith, Lakshmi Priya Kozhiparambil Rosner, Michael K. Cheung, Charles Porsev, Sergey G. Safronova, Marianna S. Worm, Steven Budker, Dmitry Pfeifer, Thomas López-Urrutia, José R. Crespo Bekker, Hendrik |
| contents | Optical transitions of highly charged ions can be very sensitive to hypothetical beyond-the-Standard-Model phenomena. Those near the $5s-4f$ level crossing, where the $5s$ and $4f$ are degenerate are especially promising. We present predictions from atomic theory and measurements of Os$^{15,16,17+}$ at an electron beam ion trap for identification of several transitions suitable for searches for a hypothetical fifth force and possible violations of local Lorentz invariance. The electric quadrupole (E2) transitions of Os$^{16+}$ that were found are especially suitable for frequency metrology due to their small linewidth of 44 $μ$Hz. Our calculations show the need for including enough inner-shell excitations to predict transition rates between configurations, which can otherwise be overestimated. Ultimately, the predicted interconfiguration transitions were too weak to be detected. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_06710 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Study of the elusive $5s-4f$ level crossing in highly charged osmium with optical transitions suitable for physics beyond the Standard Model searches Rehbehn, Nils-Holger Sajith, Lakshmi Priya Kozhiparambil Rosner, Michael K. Cheung, Charles Porsev, Sergey G. Safronova, Marianna S. Worm, Steven Budker, Dmitry Pfeifer, Thomas López-Urrutia, José R. Crespo Bekker, Hendrik Atomic Physics Optical transitions of highly charged ions can be very sensitive to hypothetical beyond-the-Standard-Model phenomena. Those near the $5s-4f$ level crossing, where the $5s$ and $4f$ are degenerate are especially promising. We present predictions from atomic theory and measurements of Os$^{15,16,17+}$ at an electron beam ion trap for identification of several transitions suitable for searches for a hypothetical fifth force and possible violations of local Lorentz invariance. The electric quadrupole (E2) transitions of Os$^{16+}$ that were found are especially suitable for frequency metrology due to their small linewidth of 44 $μ$Hz. Our calculations show the need for including enough inner-shell excitations to predict transition rates between configurations, which can otherwise be overestimated. Ultimately, the predicted interconfiguration transitions were too weak to be detected. |
| title | Study of the elusive $5s-4f$ level crossing in highly charged osmium with optical transitions suitable for physics beyond the Standard Model searches |
| topic | Atomic Physics |
| url | https://arxiv.org/abs/2509.06710 |