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The presented approach combines an efficient Ewald-type summation (ES) of atomic multipoles up to the hexadecapolar level in direct and reciprocal spaces with corrections for (i) the net polarization of the sample (the `surface term') due to a net dipole moment of the crystallographic unit cell (if present) and (ii) the short-range electron-density penetration effects. The rederived and reported closed-form expressions for all terms in the ES algorithm have been augmented by the expressions for the surface term available in the literature [Stenhammar, Trulsson &amp; Linse (2011),<jats:italic>J. Chem. Phys.<\/jats:italic><jats:bold>134<\/jats:bold>, 224104] and the exact potential expressions reported in a previous study [Volkov, King, Coppens &amp; Farrugia (2006),<jats:italic>Acta Cryst.<\/jats:italic>A<jats:bold>62<\/jats:bold>, 400\u2013408]. The resulting algorithm, coded using Fortran in the<jats:italic>XDPROP<\/jats:italic>module of the software package<jats:italic>XD<\/jats:italic>, was tested on several small molecular crystal systems (formamide, benzene, L-dopa, paracetamol, amino acids<jats:italic>etc.<\/jats:italic>) and compared with a series of EP\/MM-based direct-space summations (DS) performed within a certain number of unit cells generated along both the positive and negative crystallographic directions. The EP\/MM-based ES technique allows for a noticeably more precise determination of the EF and EFG and significantly better precision of the evaluated ESP when compared with the DS calculations, even when the latter include contributions from an array of symmetry-equivalent atoms generated within four additional unit cells along each crystallographic direction. In terms of computational performance, the ES\/EP\/MM method is significantly faster than the DS calculations performed within the extended unit-cell limits but trails the DS calculations within the reduced summation ranges. Nonetheless, the described EP\/MM-based ES algorithm is superior to the direct-space summations as it does not require the user to monitor continuously the convergence of the evaluated properties as a function of the summation limits and offers a better precision\u2013performance balance.<\/jats:p>","DOI":"10.1107\/s2053273321005532","type":"journal-article","created":{"date-parts":[[2021,7,29]],"date-time":"2021-07-29T13:25:19Z","timestamp":1627565119000},"page":"399-419","update-policy":"https:\/\/doi.org\/10.1107\/cm_01","source":"Crossref","is-referenced-by-count":4,"title":["On the calculation of the electrostatic potential, electric field and electric field gradient from the aspherical pseudoatom model. II. 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