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Abstract: We have calculated self-consistent field (SCF) and second-order MÃƒÂ¸ller-Plesset perturbation theory (MP2) for the dihaloethynes XÃ¢Â€Â“CÃ¢Â‰Â¡CÃ¢Â€Â“X, X = F, Cl, Br and I. All calculations have been performed with carefully optimized, flexible basis sets of gaussiantype functions. Our best values for the quadrupole moment (ÃŽÂ˜/ea02) are -0.6524 (FCCF), 3.6612 (ClCCCl), 5.8143 (BrCCBr) and 8.3774 (ICCI). The dipole polarizability is strongly anisotropic. For the mean (ÃŽÂ± /e2a02Eh-1) and the anisotropy (ÃŽÂ”ÃŽÂ±/e2a02Eh-1) we obtain 23.58 and 15.09 (FCCF), 51.75 and 48.30 (ClCCCl), 66.53 and 60.04 (BrCCBr), 93.79 and 78.91 (ICCI). The mean dipole hyperpolarizability (ÃŽÂ³ /e4a04Eh-3) increases rapidly as 2932 (FCCF), 9924 (ClCCCl), 17409 (BrCCBr) and 35193 (ICCI). The transversal component of the hyperpolarizability is larger than the longitudinal one for FCCF, ÃŽÂ³xxxx > ÃŽÂ³zzzz but this is reversed for the other molecules in the series. Difluoroethyne is less (hyper)polarizable than ethyne

Electric Multipole Moments and (Hyper)Polarizability of X–C≡C–X, X = F, Cl, Br and I