We use the random phase approximation (RPA) method with the singles correlation energy contributions to calculate lattice energies of ten molecular solids. While RPA gives too weak binding, underestimating the reference data by 13.7% on average, much improved results are obtained when the singles are included at the GW singles excitations (GWSE) level, with average absolute difference to the reference data of only 3.7%. Consistently with previous results, we find a very good agreement with the reference data for hydrogen bonded systems, while the binding is too weak for systems where dispersion forces dominate. In fact, the overall accuracy of the RPA+GWSE method is similar to an estimated accuracy of the reference data.

J Heyrovský Institute of Physical Chemistry Academy of Sciences of the Czech Republic Dolejškova 3 CZ 18223 Prague 8 Czech Republic and Department of Chemical Physics and Optics Faculty of Mathematics and Physics Charles University Ke Karlovu 3 CZ 12116 Prague 2 Czech Republic

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