Click on the "Data Info" button to see data source and other notes

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.

Learn more about these data

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 \(\ \rm{E}_{\rm{IP}} \)=141.1 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.113.030801". 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}} $=141.1 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.113.030801".
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.

Y. N. Joshi, A. N. Ryabtsev, and S. S. Churilov, Phys. Scr. 64, 326 (2001),
DOI: https://doi.org/10.1238/Physica.Regular.064a00326 Close

State	Energy	$\ \lambda $	$ \alpha $-variation sensitivity q	Enhancement factor K	Lifetime
$\ $	$\ \rm{cm}^{-1} $	nm	$\ \rm{cm}^{-1} $	$\ $	$\ \rm{s} $
$$5p_{1/2}$$	0	$$ $$	0	$$ $$	$$ $$
$$5p_{3/2}$$	33427	299.2	37544	2.2	0.003
$$4f_{5/2}$$	54947	182	62873	2.3	0.0812
$$4f_{7/2}$$	57520	173.9	65150	2.3	2.18

Transition	Type	Transition energy	$\ \lambda $	Matrix element	Transition rate
$\ $	$\ $	$\ \rm{cm}^{-1} $	nm	$\ $	$\ \rm{s}^{-1} $
$$5p_{3/2}-5p_{1/2}$$	M1	33427	299.2	1.151 $\ \mu_B $	3.335 $\ \times 10^{2} $
$$5p_{3/2}-5p_{1/2}$$	E2	33427	299.2	2.040 a.u.	4.86
$$4f_{5/2}-5p_{1/2}$$	E2	54947	182.0	1.146 a.u.	1.229 $\ \times 10^{1} $
$$4f_{5/2}-5p_{3/2}$$	E2	21520	464.7	0.615 a.u.	3.260 $\ \times 10^{-2} $
$$4f_{7/2}-4f_{5/2}$$	M1	2573	3887	1.851 $\ \mu_B $	1.968 $\ \times 10^{-1} $
$$4f_{7/2}-5p_{3/2}$$	E2	24093	415.1	1.518 a.u.	2.620 $\ \times 10^{-1} $

State	Energy	\(\ \lambda \)	\( \alpha \)-variation sensitivity q	Enhancement factor K	Lifetime
\(\ \)	\(\ \rm{cm}^{-1} \)	nm	\(\ \rm{cm}^{-1} \)	\(\ \)	\(\ \rm{s} \)
$$5p_{1/2}$$	0	$$ $$	0	$$ $$	$$ $$
$$5p_{3/2}$$	33427	299.2	37544	2.2	0.003
$$4f_{5/2}$$	54947	182	62873	2.3	0.0812
$$4f_{7/2}$$	57520	173.9	65150	2.3	2.18