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    Energies are given in cm\(^{-1}\). See this link for conversion factors. Electric matrix elements are given in atomic units. Magnetic dipole matrix elements are given in Bohr magnetons, \(\mu_B\). The values of magnetic-dipole hyperfine constants A are listed in MHz. Dipole polarizabilities \(\alpha\) are given in atomic units, \(a_0^3\), where \(a_0\) is the Bohr radius. The atomic units for \(\alpha\) can be converted to SI units via \(\alpha /h \rm{[Hz/(V/m)^2]}\)\(=2.48832 \times 10^{-8} \alpha \) [a.u.], where the conversion coefficient is \( 4\pi \epsilon_0 a^3_0/h \) and the Planck constant \(h\) is factored out.

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    Data are taken from, “S. G. Porsev, U. I. Safronova, M. S. Safronova, P. O. Schmidt, A. I. Bondarev, M. G. Kozlov, I. I. Tupitsyn, and C. Cheung, Phys. Rev. A 102, 012802 (2020), DOI: https://doi.org/10.1103/PhysRevA.102.012802”, unless noted otherwise.
    Notes:
    1) The uncertainty of the clock transition energy is \(\ \sim \)1800 cm\(\ ^{-1}\).
    2) Estimated accuracy of the hyperfine constant is 20-30%.
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    State Energy \(\ \lambda \) Lifetime \(\ \langle \gamma J ||Q|| \gamma J\rangle \) Quadrupole moment Polarizability \(\ A/g_{_{_{I}}} \)
    \(\ \) \(\ \rm{cm^{-1}} \) nm s \(\ |e|a_0^2 \) \(\ |e|a_0^2 \) \(\ a_0^3 \) MHz
    $$5f 6p^2\,\,^2\!F^o_{5/2}$$ 0 $$\approx 0.31$$ 0.15 0.89 4200
    $$5f^2 6p\,\,^4\!I^o_{9/2}$$ 16172 618.352708 1322 $$\approx 0.53$$ 0.25 0.986 21000
    $$5f 6p^2\,\,^2\!F^o_{7/2}$$ 22610 442.282176 0.009 $$ $$ $$ $$ $$ $$ $$ $$
    $$5f^2 6p\,\,^2\!F^o_{5/2}$$ 30984 322.747224 0.18 $$ $$ $$ $$ $$ $$ $$ $$
    $$5f^2 6p\,\,^2\!D^o_{3/2}$$ 32353 309.090347 $$ $$ $$ $$ $$ $$ $$ $$ $$ $$
    $$5f^2 6p\,\,^2\!G^o_{7/2}$$ 32400 308.641975 $$ $$ $$ $$ $$ $$ $$ $$ $$ $$
    $$5f^2 6p\,\,^4\!I^o_{11/2}$$ 40450 247.218789 0.003 $$ $$ $$ $$ $$ $$ $$ $$
    $$5f^2 6p\,\,^4\!H^o_{9/2}$$ 41457 241.213788 $$ $$ $$ $$ $$ $$ $$ $$ $$ $$
    $$(6p^2 6d)_{3/2}$$ 537515 18.604132 $$ $$ $$ $$ $$ $$ $$ $$ $$ $$
    $$(5f 6p 6d)_{9/2}$$ 541773 18.457915 $$ $$ $$ $$ $$ $$ $$ $$ $$ $$
    $$(5f 6p 6d)_{7/2}$$ 545245 18.340379 $$ $$ $$ $$ $$ $$ $$ $$ $$ $$
    $$(5f 6p 6d)_{5/2}$$ 545939 18.317065 $$ $$ $$ $$ $$ $$ $$ $$ $$ $$
    $$(5f 6p 6d)_{3/2}$$ 553637 18.062377 $$ $$ $$ $$ $$ $$ $$ $$ $$ $$

    Clock transition \(\ 5f^2 6p\,\, ^4\!I^o_{9/2} \rightarrow \,5f 6p^2\,\, ^2\!F^o_{5/2} \)
    Clock frequency 4.8 \(\ \times 10^{14}\) Hz
    Fractional Black Body Radiation shift at T=300K \(\ -1.7 \times 10^{18} \)