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The recently proposed many-pair expansion (MPE) [T. Zhu et al., Phys. Rev. B 93, 201108(R) (2016)] is a hierarchy of approximations that systematically corrects any deficiencies of an approximate functional to finally converge to the exact energy. This is achieved by decomposing the total density into a sum of two-electron densities and accounting for successive two-, four-, six-,\u2026 electron interactions. Here, we show that already low orders of MPE expansion recover the dispersion energy accurately. To this end, we employ the Pariser-Parr-Pople Hamiltonian and study the behavior of long-range interactions in trans-polyacetylene as well as stacks of ethylene and benzene molecules. We also show how convergence of the expansion is affected by electron conjugation and the choice of the density partitioning.<\/jats:p>","DOI":"10.1063\/1.4973728","type":"journal-article","created":{"date-parts":[[2017,1,13]],"date-time":"2017-01-13T16:01:11Z","timestamp":1484323271000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":9,"title":["Long-range interactions from the many-pair expansion: A different avenue to dispersion in DFT"],"prefix":"10.1063","volume":"146","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0008-0157","authenticated-orcid":false,"given":"Piotr","family":"de Silva","sequence":"first","affiliation":[{"name":"Massachusetts Institute of Technology Department of Chemistry, , 77 Massachusetts Ave., Cambridge, Massachusetts 02139, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tianyu","family":"Zhu","sequence":"additional","affiliation":[{"name":"Massachusetts Institute of Technology Department of Chemistry, , 77 Massachusetts Ave., Cambridge, Massachusetts 02139, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Troy","family":"Van Voorhis","sequence":"additional","affiliation":[{"name":"Massachusetts Institute of Technology Department of Chemistry, , 77 Massachusetts Ave., Cambridge, Massachusetts 02139, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"317","published-online":{"date-parts":[[2017,1,13]]},"reference":[{"key":"2023062600462755600_c1","doi-asserted-by":"publisher","first-page":"A1133","DOI":"10.1103\/PhysRev.140.A1133","volume":"140","year":"1965","journal-title":"Phys. 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