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Approximate exchange-correlation functionals struggle with such systems, leading to pervasive delocalization and static correlation errors. We demonstrate how these errors, which plague density-functional calculations of bond-stretching processes, can be avoided by employing the alternative framework of partition density-functional theory (PDFT) even using the local density approximation for the fragments. Our method is illustrated with explicit calculations on simple systems exhibiting delocalization and static-correlation errors, stretched H2+, H2, He2+, Li2+, and Li2. In all these cases, our method leads to greatly improved dissociation-energy curves. The effective KS potential corresponding to our self-consistent solutions displays key features around the bond midpoint; these are known to be present in the exact KS potential, but are absent from most approximate KS potentials and are essential for the correct description of electron dynamics.<\/jats:p>","DOI":"10.1063\/1.4937771","type":"journal-article","created":{"date-parts":[[2015,12,17]],"date-time":"2015-12-17T18:17:17Z","timestamp":1450376237000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":28,"title":["Fragment-based treatment of delocalization and static correlation errors in density-functional theory"],"prefix":"10.1063","volume":"143","author":[{"given":"Jonathan","family":"Nafziger","sequence":"first","affiliation":[{"name":"Purdue University 1 Department of Chemistry, , 560 Oval Dr., West Lafayette, Indiana 47907, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Adam","family":"Wasserman","sequence":"additional","affiliation":[{"name":"Purdue University 1 Department of Chemistry, , 560 Oval Dr., West Lafayette, Indiana 47907, USA"},{"name":"Purdue University 2 Department of Physics and Astronomy, , 525 Northwestern Ave., West Lafayette, Indiana 47907, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"317","published-online":{"date-parts":[[2015,12,17]]},"reference":[{"key":"2023062609432485900_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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