... H₂

Tables A1 and A2 are only available in electronic form at http://www.edpsciences.org

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... approach

The R12 coupled cluster theory with singles, doubles and perturbative triples properly describes the electron-electron cusp by including explicitly the inter-electronic coordinates into the wavefunction (Noga & Kutzelnigg 1994; see also Noga & Valiron 2002, for a review).

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... frozen

This approximation is of little consequence as core correlation effects are minor for the CO-H₂interaction (about 0.3 cm^-1 at 7 bohrs separation).

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... as

$\star$ denotes the complex conjugate. Note that the angular conventions of Green (1975) are slightly different from those of Jankowski & Szalewicz (1998).

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... points

The residual differences indicate the cumulative effects of the higher expansion terms.

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