Abstract
A single indium ion stored in a radio frequency trap and laser-cooled to a temperature below 1 mK can serve as an optical frequency standard of exceptionally high accuracy and stability. Probing the 5s21S0 - 5s5p3P0 transition of 115In+ at λ = 237 nm with a natural linewidth of 0.8 Hz by a sub-Hertz linewidth laser can lead to an accuracy of 10–18 after several days of averaging. So far, a fractional resolution of 1.3 × 10–13 has been obtained, limited by the frequency fluctuations of the laser exciting the 1S0 - 3P0 resonance. The absolute frequency of the 1S0 - 3P0 transition was determined to 1 267 402 452 899.92(0.23) kHz (Δ ν / ν = 1.8 × 10–13), where the measurement uncertainty is dominated by the frequency uncertainty of the He–Ne laser serving as a reference. Further improvements in this measurement together with a comparison with other narrow atomic resonances would allow investigations of variations of fundamental constants in time.
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Eckle, P., Eichenseer, M., Nevsky, A.Y., Schwedes, C., von Zanthier, J., Walther, H. (2004). An Optical Frequency Standard Basedon the Indium Ion. In: Karshenboim, S.G., Peik, E. (eds) Astrophysics, Clocks and Fundamental Constants. Lecture Notes in Physics, vol 648. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-40991-5_16
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