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We report an improved absolute frequency measurement of the 5s21S0 -5s5p 3P0 narrowline clock transition at 236.5 nm, for a single trapped and laser cooled 115In+. Using a narrowline laser as the local oscillator, a linewidth of 43 Hz for the transition is resolved. For absolute frequency measurement we use an optical frequency comb referenced to a cesium clock The transition frequency is found to...
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