The dispersion coefficients (in au) for the ground state of alkali atoms interacting with the ground states of alkaline-earth atoms
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Table 2. The dispersion coefficients (in au) for the ground state of alkali atoms interacting with the ground states of alkaline-earth atoms. The numbers in the square brackets denote powers of ten. C6 coefficients derived from MBPT-SD and CI+MBPT dynamic polarizability  are given in the rows with no other Cn coefficients and have estimated errors given by the numbers in brackets. The notation a[b] means a × 10b.
Dispersion coefficients between the alkali metal atoms (Li–Rb) and alkaline-earth metal atoms (Be–Sr) are evaluated using matrix elements computed from frozen core configuration interaction calculations. Besides dispersion coefficients with both atoms in their respective ground states, dispersion coefficients are also given for the case where one atom is in its ground state and the other atom is in a low-lying excited state.