Abstract
The derivation of the dispersion coefficients for various symmetries of the lower $\mathrm{nP}$-$\mathrm{nP}$ asymptote of the homonuclear alkali-metal dimers is presented. Using the perturbation theory the dispersion coefficients ${C}_{5}$ are obtained in the first order and the ${C}_{6}$ and ${C}_{8}$ coefficients are obtained in the second order in terms of double sums involving atomic radial matrix elements. The sums are separated in individual contributions of each atom by using a complex integral representation. The atomic matrix elements involving Green's functions are evaluated using the Dalgarno-Lewis method. Numerical results for the ${C}_{5}$, ${C}_{6}$, and ${C}_{8}$ dispersion coefficients for Li, Na, K, Rb, and Cs dimers are presented.
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