The stark shift of the hyperfine structure of an atom with a2 S 1/2 ground state

Nikolai L. Manakov, V. D. Ovsyannikov, Л. П. Рапопорт

A. A. Kiselev, A. V. Lyaptsev, Vladimir G Bordo

Maximilian Doppelbauer, S. C. Wright, Simon Hofsäss +3 more

We report on hyperfine-resolved laser spectroscopy of the A2Π ← X2Σ+ transition of magnesium monofluoride (MgF), relevant for laser cooling. We recorded 25 rotational transitions with an absolute accuracy of better than 20 MHz, assigned 56 hyperfine lines, and determined precise rotational, fine, and hyperfine structure parameters for the A2Π state. The radiative lifetime of the A2Π state was determined to be 7.2(3) ns, in good agreement with ab initio calculations. The transition isotope shift between bosonic isotopologues of the molecule is recorded and compared to predicted values within the Born–Oppenheimer approximation. We measured the Stark effect of selected rotational lines of the A2Π ← X2Σ+ transition by applying electric fields of up to 10.6 kV cm−1 and determined the permanent electric dipole moments of 24MgF in its ground X2Σ+ and first excited A2Π states to be μX = 2.88(20) D and μA = 3.20(22) D, respectively. Based on these measurements, we caution for potential losses from the optical cycling transition due to electric field induced parity mixing in the excited state. In order to scatter 104 photons, the electric field must be controlled to below 1 V cm−1.

X. Wang, J. Jiang, Lu-You Xie +2 more

The hyperfine stark shifts of ground states of 87, 85 Rb are calculated by using relativistic configuration interaction plus core polarization (RCICP) approach, which agree with other theoretical and experimental results very well. The hyperfine Stark shift of 87 Rb is larger than that of 85 Rb.

Erna Karule, A. Gailītis

Jun Jiang, Jim Mitroy

The influence of hyperfine interactions on the tune-out wavelengths of the ${}^{39}$K, ${}^{40}$K, and ${}^{41}$K isotopes of the potassium atom was investigated. The hyperfine interaction of the $4{s}_{1/2}$ ground state results in a shift and splitting of the primary tune-out wavelength near 769 nm. The $4{s}_{1/2}$ state hyperfine splittings of the primary tune-out wavelength were almost equal to the hyperfine splittings of the ground states. The splittings in the wavelengths were 0.0009, 0.0026, and 0.0005 nm for ${}^{39}$K, ${}^{40}$K, and ${}^{41}$K, respectively. The hyperfine splitting of the $n{p}_{J}$ levels leads to the creation of additional tune-out wavelengths. The additional tune-out wavelengths could be difficult to detect due to very small differences from the transition wavelengths to the $4{p}_{J,F}$ states. The hyperfine Stark shift for the ground states of all three isotopes was also computed, and the value for ${}^{39}$K was found to be compatible with the previous experiments and the most recent calculation using relativistic many-body perturbation theory.