Predicted 10,000-fold electronic-bridge enhancement for exciting the 229Th nuclear clock transition in Th III, plus a 1.7-times lifetime reduction and strong new-physics sensitivity factors.
Enhanced sensitivity to the fine-structure constant variation in Th IV atomic clock transition
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Our calculations have shown that the 5f_5/2-7s_1/2 23131 cm^{-1} transition from the ground state in the ion Th^{3+} is very sensitive to the temporal variation of the fine structure constant alpha (q=-75300 cm^{-1}). The line is very narrow, the ion has been trapped and laser cooled and the positive shifter line 5f_5/2-5f_7/2 4325 cm^{-1} (q=+2900 cm^{-1}) may be used as a reference. A comparison may also be made with a positive shifter in another atom or ion. This makes Th^{3+} a good candidate to search for the alpha variation.
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Using the Th III Ion for a Nuclear Clock and Searches for New Physics
Predicted 10,000-fold electronic-bridge enhancement for exciting the 229Th nuclear clock transition in Th III, plus a 1.7-times lifetime reduction and strong new-physics sensitivity factors.