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Several representative three\u2010dimensional (3D) systems (Henon\u2013Heiles and Eckart potentials, and the <jats:italic>H<\/jats:italic><jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/tex2gif-stack-2.gif\" xlink:title=\"urn:x-wiley:01928651:media:JCC540150402:tex2gif-stack-2\" \/> molecule) are studied, and NC\u2013FEM results are compared with those published by other authors. For the <jats:italic>H<\/jats:italic><jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/tex2gif-stack-3.gif\" xlink:title=\"urn:x-wiley:01928651:media:JCC540150402:tex2gif-stack-3\" \/>, a vibrational Hamiltonian expressed in terms of the three internuclear distances is integrated, and the results obtained are compared with the experimental ones. \u00a9 1994 by John Wiley &amp; Sons, Inc.<\/jats:p>","DOI":"10.1002\/jcc.540150402","type":"journal-article","created":{"date-parts":[[2005,1,2]],"date-time":"2005-01-02T01:03:30Z","timestamp":1104627810000},"page":"377-384","source":"Crossref","is-referenced-by-count":3,"title":["Normal coordinates\u2013finite elements calculation of 3D vibrational energy levels: Henon\u2014Heiles and Eckart potentials, H molecule"],"prefix":"10.1002","volume":"15","author":[{"given":"J. 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