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×î¼òµ¥µÄ·½·¨ÊǼÓiop(5/13=1),Èç¹û»¹²»ÐÐ,¿ÉÒÔÊÔÊÔÒÔϵÄһЩ·½·¨ 1/ - SCF=qc will probably solve the problem, albeit at a cost - Change the SCF converger to either SD, Quadratic or Fermi 2/ - lower the symmetry of optimize with and optimize with the "nosymm" keyword 3/ - scf=(Maxconventionalcycles=300,xqc) I solved the problem using a variation on the first suggestion. Normally the scf took less than 80 cycles to converge. So i used scf=(Maxconventionalcycles=100,xqc) which resulted in a good compromise between using scf=qc and optimisation speed. In the case of the DIIS error the scf always took more than 100 cycles before the error, so by adding scf=(Maxconventionalcycles=100,xqc) the scf switched to qc after 100 cycles in the standard DIIS mode |

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