Abstract.
We report greater than two orders of magnitude improvements in the absolute frequency and isotope shift measurements of the In+ 5s2 1S0 (F = 9/2)–5s5p 3P1 (F = 11/2) transition near 230.6 nm. The laser-induced fluorescence from a single In+ in a radio-frequency trap is detected. The fourth-harmonic of a semiconductor laser is used as the light source. The absolute frequency is measured with the help of a frequency comb referenced to a Cs atomic clock. The resulting transition frequencies for isotopes 115In+ and 113In+ are measured to be 1 299 648 954.54(10) MHz and 1 299 649 585.36(16) MHz, respectively. The deduced cooling transition frequency difference is 630.82(19) MHz. By taking into account of the hyperfine interaction, the isotope shift is calculated to be 695.76(1.68) MHz.
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Wang, Y., Dumke, R., Zhang, J. et al. Absolute frequency and isotope shift measurements of the cooling transition in singly ionized indium. Eur. Phys. J. D 44, 307–311 (2007). https://doi.org/10.1140/epjd/e2007-00171-0
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DOI: https://doi.org/10.1140/epjd/e2007-00171-0