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The extent of the underestimation should be addressed and given. ¾ÍÊÇÈÃÄã°ÑDFT·½·¨±¾ÉíµÄȱÏݶԽá¹ûµÄ¿ÉÄÜÓ°ÏìÌÖÂÛһϡ£Êµ¼ÊÉÏÆÀÉóÈËÒѾ¸øÄãдºÃÁ½¾äÁË¡£°ÑÏÂÃæµÄ»°¸Äдһϱä³ÉÄã×Ô¼ºµÄ£¬È»ºó¸úÄãµÄ½á¹û½áºÏÆðÀ´ÒýÉêÒ»ÏÂдһС¶Î¾Í³ÉÁË¡£ the functionals applied in PW calculations lack the exact exchange which is often proved to be very important in the accurate calculations of reaction barriers. Especially, when the barrier is due to bond formations and breakings, the GGA functionals underestimate the barriers because of the improper treatment of the self-interaction contributions. |
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