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It is shown that the correlation energy changes drastically (with a symmetric sigmoidal-type shape) near the geometry (R\u223c1.6\u2002\u00c5) where the two lowest \u03a31g+ adiabatic states show the avoided crossing. The implications of such a feature on extrapolating the dynamical correlation are then analyzed, and the attributes of the extrapolated ground electronic state shown to be in excellent agreement with the most recent experimental data available in the literature.<\/jats:p>","DOI":"10.1063\/1.3036115","type":"journal-article","created":{"date-parts":[[2008,12,17]],"date-time":"2008-12-17T23:28:40Z","timestamp":1229556520000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":63,"title":["Extrapolation to the complete-basis-set limit and the implications of avoided crossings: The X\u2009\u03a31g+, B\u2009\u03941g, and B\u2032\u2009\u03a31g+ states of C2"],"prefix":"10.1063","volume":"129","author":[{"given":"A. J. 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