| Autor: |
A, Windberger, J R, Crespo López-Urrutia, H, Bekker, N S, Oreshkina, J C, Berengut, V, Bock, A, Borschevsky, V A, Dzuba, E, Eliav, Z, Harman, U, Kaldor, S, Kaul, U I, Safronova, V V, Flambaum, C H, Keitel, P O, Schmidt, J, Ullrich, O O, Versolato |
| Rok vydání: |
2015 |
| Zdroj: |
Physical review letters. 114(15) |
| ISSN: |
1079-7114 |
| Popis: |
We measure optical spectra of Nd-like W, Re, Os, Ir, and Pt ions of particular interest for studies of a possibly varying fine-structure constant. Exploiting characteristic energy scalings we identify the strongest lines, confirm the predicted 5s-4f level crossing, and benchmark advanced calculations. We infer two possible values for optical M2/E3 and E1 transitions in Ir^{17+} that have the highest predicted sensitivity to a variation of the fine-structure constant among stable atomic systems. Furthermore, we determine the energies of proposed frequency standards in Hf^{12+} and W^{14+}. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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