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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, “M. S. Safronova, V. A. Dzuba, V. V. Flambaum, U. I. Safronova, S. G. Porsev, and M. G. Kozlov, Phys. Rev. A 90, 042513 (2014), DOI: https://doi.org/10.1103/PhysRevA.90.042513", unless noted otherwise.
    Notes:
    1) Experimental energies from are used in calculation of transition rate and lifetime.
    3) Transition types ‘M1’ and ‘E2’ stand for magnetic dipole and electric quadrupole transition, respectively.
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    Kramida, A., Ralchenko, Yu., Reader, J. and NIST ASD Team (2021). NIST Atomic Spectra Database (version 5.9), [Online]. Available: https://physics.nist.gov/asd. National Institute of Standards and Technology, Gaithersburg, MD.
    DOI: https://doi.org/10.18434/T4W30F Close

    State Energy
    		\(\ \lambda \)
    		Lifetime
    \(\ \) \(\ \rm{cm}^{-1} \) nm s
    $$5p_{1/2}$$ 0 $$ $$ $$ $$
    $$5p_{3/2}$$ 19379 516.01 1.52 \(\ \times 10^{-2} \)
    $$4f_{5/2}$$ 166538 60.05 6.71 \(\ \times 10^{-5} \)
    $$4f_{7/2}$$ 167297 59.77 1.03\(\ \times 10^{-4} \)

    Transition Type Transition energy
    		\(\ \lambda \)
    		 Matrix element
    		 Transition rate
    \(\ \) \(\ \) \(\ \rm{cm}^{-1} \) nm \(\ \) \(\ \rm{s} ^{-1} \)
    $$5p_{3/2}-5p_{1/2}$$ M1 19379 516.0 1.152 \(\ \mu_B \) 65.1
    $$5p_{3/2}-5p_{1/2}$$ E2 19379 516.0 2.885 a.u. 6.371 \(\ \times 10^{-1} \)
    $$4f_{5/2}-5p_{1/2}$$ E2 166538 60.05 2.315 a.u. 1.282 \(\ \times 10^{4} \)
    $$4f_{5/2}-5p_{3/2}$$ E2 147159 67.95 1.271 a.u. 2.080 \(\ \times 10^{3} \)
    $$4f_{7/2}-4f_{5/2}$$ M1 759 13175 1.851 \(\ \mu_B \) 5.053 \(\ \times 10^{-3} \)
    $$4f_{7/2}-4f_{5/2}$$ E2 759 13175 0.784 a.u. 2.166 \(\ \times 10^{-9} \)
    $$4f_{7/2}-5p_{3/2}$$ E2 147918 67.61 3.123 a.u. 9.668 \(\ \times 10^{3} \)