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Ab initio calculations have also been carried out to establish the potential energy surfaces for the triply degenerate electronic manifold of \\documentclass[12pt]{minimal}\\begin{document}${\\rm CH}_4^+$\\end{document} CH 4+. A suitable diabatic vibronic Hamiltonian has been devised and the nonadiabatic effects due to Jahn-Teller conical intersections on the vibronic dynamics investigated in detail. The theoretical results show fair accord with experiment.<\/jats:p>","DOI":"10.1063\/1.3658641","type":"journal-article","created":{"date-parts":[[2011,11,4]],"date-time":"2011-11-04T22:48:39Z","timestamp":1320446919000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":31,"title":["The Jahn-Teller effect in the triply degenerate electronic state of methane radical cation"],"prefix":"10.1063","volume":"135","author":[{"given":"T.","family":"Mondal","sequence":"first","affiliation":[{"name":"Universidade de Coimbra Departamento de Qu\u00edmica, , 3004-535 Coimbra, Portugal"}]},{"given":"A. J. 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