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We report measurements of the isotope shifts of two transitions ($4{f}^{4}6s\ensuremath{\rightarrow}{[25044.7]}_{7/2}^{o}$ and $4{f}^{4}6s\ensuremath{\rightarrow}{[25138.6]}_{7/2}^{o}$) in neodymium ions (${\mathrm{Nd}}^{+}$) with hundredfold improved accuracy, using laser spectroscopy of a cryogenically cooled neutral plasma.… Click to show full abstract
We report measurements of the isotope shifts of two transitions ($4{f}^{4}6s\ensuremath{\rightarrow}{[25044.7]}_{7/2}^{o}$ and $4{f}^{4}6s\ensuremath{\rightarrow}{[25138.6]}_{7/2}^{o}$) in neodymium ions (${\mathrm{Nd}}^{+}$) with hundredfold improved accuracy, using laser spectroscopy of a cryogenically cooled neutral plasma. The isotope shifts were measured across a set of five spin-zero isotopes that spans a nuclear shape transition. We discuss the prospects for further improvements to the accuracy of ${\mathrm{Nd}}^{+}$ isotope shifts using optical clock transitions, which could enable extremely precise tests of King plot linearity for new physics searches.
Journal Title: Physical Review A
Year Published: 2020
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