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Long range electrostatic, induction and dispersion coefficients includingterms of order $R^{-8}$ have been calculated by the sum over states methodusing time dependent density functional theory. We also computed electrostaticmoments and static polarizabilities of the individual diatoms up to theoctopole order using coupled cluster and density functional theory. Thelaboratory-frame transformed electrostatic moments and van der Waalscoefficients corresponding to the alignment of the diatomic molecules werefound. We use this transformation to obtain the coupling induced by an externalDC electric field, and present values for all XY combinations of like polaralkali diatomic molecules with atoms from Li to Cs. Analytic solutions to thedressed-state laboratory-frame electrostatic moments and long rangeintermolecular potentials are also given for the DC low-field limit.

Long range forces between polar alkali diatoms aligned by external electric fields