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This program features Gaussian basis sets with \u2113 &amp;gt; 6; scalar special relativity via the spin-free method; convergence to C\u221ev, D\u221ev, or spherical electronic states; special code to determine Rydberg orbitals; both uncontracted and contracted MRCISD wavefunctions; one and two electron properties, including full spin\u2013orbit matrix elements with the Breit interaction; analytic calculation of Born\u2013Oppenheimer diagonal correction for multi-configuration Hartree\u2013Fock wavefunctions; and analytic calculation of second order Born\u2013Oppenheimer corrections for Hartree\u2013Fock wavefunctions. The program can be obtained from software.nasa.gov.<\/jats:p>","DOI":"10.1063\/5.0135248","type":"journal-article","created":{"date-parts":[[2023,2,7]],"date-time":"2023-02-07T02:36:55Z","timestamp":1675737415000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":6,"title":["Introducing MPEC: Massively parallel electron correlation"],"prefix":"10.1063","volume":"158","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0806-6090","authenticated-orcid":false,"given":"David W.","family":"Schwenke","sequence":"first","affiliation":[{"name":"NASA Ames Research Center Mail Stop 258-2 , P.O. Box 1, Moffett Field, California 94035-0001, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"317","published-online":{"date-parts":[[2023,2,23]]},"reference":[{"key":"2023122821182338400_c1","doi-asserted-by":"publisher","first-page":"5803","DOI":"10.1063\/1.455556","volume":"89","year":"1988","journal-title":"J. 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