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We measure the frequency of the 5s 21 S 0 –5s5p 3 P 0 narrowline clock transition at 236.5nm, for a single, trapped and laser cooled 115 In + ion. In the experiment, an ultra-narrow linewidth laser (<1.34Hz at 3s integration time) is used to interrogate the clock transition for high resolution spectroscopy. A linewidth of 43Hz of the clock transition...
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