Long-range interactions between Mg atoms

G. L. Gattobigio, F. Michaud, G. Labeyrie +2 more

Jun-Yi Zhang, Jim Mitroy, Z.-C. Yan +3 more

Dispersion coefficients for the long-range interactions of the first four excited states of He, i.e., He(2 (1, 3)S) and He(2 (1, 3)P), with the low-lying states of the alkaline earth atoms Mg, Ca, and Sr are calculated by summing over the reduced matrix elements of multipole transition operators.

Jim Mitroy, J.-Y. Zhang

A procedure for systematically evaluating the long-range dispersion interaction between two homonuclear atoms in arbitrary $LS$ coupled states is outlined. The method is then used to generate dispersion coefficients for a number of the low-lying states of the Na and Mg dimers.

Jun-Yi Zhang, Zong-Chao Yan, D. Vrinceanu +1 more

Andrei Derevianko

Metastability and long-range interactions of Mg, Ca, and Sr in the lowest-energy metastable $^{3}P_{2}$ state are investigated. The calculated lifetimes are 38 min for ${\mathrm{Mg}}^{*}$, 118 min for ${\mathrm{Ca}}^{*}$, and 17 min for ${\mathrm{Sr}}^{*}$, supporting feasibility of cooling and trapping experiments. The quadrupole-quadrupole long-range interactions of two metastable atoms are evaluated for various molecular symmetries. Hund's case (c) ${4}_{g}$ potential possesses a large 100--1000 K potential barrier. Therefore magnetic trap losses can possibly be reduced using cold metastable atoms in a stretched $M\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}2$ state. Calculations were performed in the framework of ab initio relativistic configuration interaction method coupled with the random-phase approximation.