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most citedAbsolute frequency measurement of the 40Ca+ S1/2 - D5/2 clock transition

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physics.atom-ph2003

A clock transition for a future optical frequency standard with trapped atoms

I. Courtillot, A. Quessada, R. P. Kovacich +5

We report the first direct excitation of the strongly forbidden 5s2 1S0-5s5p 3P0 transition in 87Sr. Its frequency is 429 228 004 235 (20) kHz. A resonant laser creates a small lea…