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[½»Á÷] GGA/PBE/DNPÓëB3LYP/6-311++G(d,p)µÄ¿É¿¿ÐÔ

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I am concerned about the level of theory used for the computation of the relative energies of intermediates and transition states on the potential energy surfaces , GGA/PBE/DNP. Is such a level  really adequate to obtain definitive results of the ring based molecules? why not to use i.e. B3LYP/6-311++G(d,p)?

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