Dispersion coefficients for interactions among H, Li, Na, K atoms with Debye-Hückel potentials

The effect of Debye-Hückel screening on the dispersion coefficients C6, C8, C10 for interactions among H, Li, Na and K atoms has been investigated using the symplectic algorithm. The C6, C8, C10 coefficients for interactions among alkali-metal atoms along with the dipole, quadrupole and octupole polarizabilities of K atom for various screening parameters are reported for the first time in the literature. In free-atomic cases, our results are comparable with available theoretical and experimental results.

► Dispersion coefficients Cn(n≥6) for interactions among H, Li, Na, K are presented. ► Energies and multipole polarizabilities of K atom are also presented. ► Energies and eigenfunctions are obtained by using the symplectic algorithm. ► Screening effects on the polarizabilities and dispersion coefficients are reported. ► Comparisons are also made with the available theoretical and experimental results.