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lib200410

铜虫 (初入文坛)

[交流] 【求助】消去虚频时候出现l502问题

计算的时候出现虚频,使用坐标中和的方法调节来消除虚频,但是却出现l502中断的问题,哪位高手指点一下
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mchen10

金虫 (正式写手)

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xuefei06(金币+2,VIP+0):thanks! 3-7 00:12
Several cases for l502.exe:
a) Density matrix is not changing but DIIS error= 1.32D-06 CofLast= 1.18D-02.
The SCF is confused. Error termination via Lnk1e in /l502.exel

Solution: Problem with DIIS. Turn it off completely, e.g. using SCF=qc, or partly by using SCF=(maxconventionalcycles=N,xqc), where N is the number of steps DIIS should be used

b) Convergence criterion not met. SCF Done:  E(RHF) =  NNNNNNN     A.U. after  129 cycles
[...] Convergence failure -- run terminated. Error termination via Lnk1e in /l502.exe

Solution: One SCF cycle has a default of maximum 128 steps, and this was exceeded without convergence achieved. Possible solution: In the route section of input file, specify SCF=(MaxCycle=N), where N is the number of steps per SCF cycles. Alternatively, turn off DIIS (e.g. by SCF=qc)

and iop(5/13=1) does work sometimes too
更痛苦的是梦没醒路已经不能走了
3楼2009-03-06 00:56:26
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