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See "About the project’’ for transition rate formulas and explanation of units

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) Ground state ionization energy \(\ \rm{E}_{\rm{IP}} \) = 101.2 eV is given in, “M. S. Safronova, V. A. Dzuba, V. V. Flambaum, U. I. Safronova, S. G. Porsev, and M. G. Kozlov, Phys. Rev. Lett. 113, 030801 (2014), DOI: https://doi.org/10.1103/PhysRevLett.113.03080". 2) 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.

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) Ground state ionization energy $\ \rm{E}_{\rm{IP}} $ = 101.2 eV is given in, “M. S. Safronova, V. A. Dzuba, V. V. Flambaum, U. I. Safronova, S. G. Porsev, and M. G. Kozlov, Phys. Rev. Lett. 113, 030801 (2014), DOI: https://doi.org/10.1103/PhysRevLett.113.03080".
2) 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.

State	Energy	$\ \lambda $	Lifetime
$\ $	$\ \rm{cm}^{-1} $	nm	s
$$5p_{1/2}$$	0	$$ $$	$$ $$
$$5p_{3/2}$$	23592	423.87	8.43 $\ \times 10^{-3} $
$$4f_{5/2}$$	137385	72.79	3.13 $\ \times 10^{-4} $
$$4f_{7/2}$$	138675	72.11	6.30 $\ \times 10^{-4} $

Transition	Type	Transition energy	$\ \lambda $	Matrix element	Transition rate
$\ $	$\ $	$\ \rm{cm}^{-1} $	$\ \rm{nm} $	$\ $	$\ \rm{s}^{-1} $
$$5p_{3/2}-5p_{1/2}$$	M1	23592	423.87	1.151 $\ \mu_B $	1.174 $\ \times 10^2 $
$$5p_{3/2}-5p_{1/2}$$	E2	23592	423.87	2.544 a.u.	1.324
$$4f_{5/2}-5p_{1/2}$$	E2	137385	72.79	1.770 a.u.	2.862 $\ \times 10^3 $
$$4f_{5/2}-5p_{3/2}$$	E2	113793	87.88	0.963 a.u.	3.304 $\ \times 10^2 $
$$4f_{7/2}-4f_{5/2}$$	M1	1290	7752	1.851 $\ \mu_B $	2.480 $\ \times 10^{-2} $
$$4f_{7/2}-5p_{3/2}$$	E2	115083	86.89	2.371 a.u.	1.589 $\ \times 10^3 $

State	Energy	\(\ \lambda \)	Lifetime
\(\ \)	\(\ \rm{cm}^{-1} \)	nm	s
$$5p_{1/2}$$	0	$$ $$	$$ $$
$$5p_{3/2}$$	23592	423.87	8.43 \(\ \times 10^{-3} \)
$$4f_{5/2}$$	137385	72.79	3.13 \(\ \times 10^{-4} \)
$$4f_{7/2}$$	138675	72.11	6.30 \(\ \times 10^{-4} \)