CCL: Maximum Force and RMS force not coverged. What should I do?



Dear Ehsan,
Try restarting your job from the last point by calculating analytic hessian at the first step. So modify the key word opt onto opt=calcfc. You can also add the key word nosymm if you don't need a constraint symmetry.
Hope this will help,

Best regards,

On 30 January 2011 12:09, Ehsan shakerzadeh ehsan_shakerzadeh() yahoo.com <owner-chemistry[A]ccl.net> wrote:

Sent to CCL by: "Ehsan  shakerzadeh" [ehsan_shakerzadeh|*|http://yahoo.com" target="_blank">yahoo.com]
Dear All,
I run a job for a week. after a week  Maximum Displacement and RMS     Displacement are converged but Maximum Force and  RMS force are not converged.some last SCF steps are also appered:
SCF Done:  E(RB+HF-LYP) =  -3193.08688985     A.U. after   17 cycles
 SCF Done:  E(RB+HF-LYP) =  -3193.09622481     A.U. after   12 cycles
 SCF Done:  E(RB+HF-LYP) =  -3193.09657987     A.U. after   16 cycles
 SCF Done:  E(RB+HF-LYP) =  -3193.09662031     A.U. after    9 cycles
 SCF Done:  E(RB+HF-LYP) =  -3193.09662458     A.U. after    8 cycles
 SCF Done:  E(RB+HF-LYP) =  -3193.09662526     A.U. after    6 cycles
 SCF Done:  E(RB+HF-LYP) =  -3193.09662536     A.U. after    4 cycles
 SCF Done:  E(RB+HF-LYP) =  -3193.08688985     A.U. after   17 cycles
 SCF Done:  E(RB+HF-LYP) =  -3193.09622481     A.U. after   12 cycles
 SCF Done:  E(RB+HF-LYP) =  -3193.09657987     A.U. after   16 cycles
 SCF Done:  E(RB+HF-LYP) =  -3193.09662031     A.U. after    9 cycles
 SCF Done:  E(RB+HF-LYP) =  -3193.09662458     A.U. after    8 cycles
 SCF Done:  E(RB+HF-LYP) =  -3193.09662526     A.U. after    6 cycles
 SCF Done:  E(RB+HF-LYP) =  -3193.09662536     A.U. after    6 cycles
 SCF Done:  E(RB+HF-LYP) =  -3193.08688994     A.U. after   17 cycles
 SCF Done:  E(RB+HF-LYP) =  -3193.09622477     A.U. after   12 cycles
 SCF Done:  E(RB+HF-LYP) =  -3193.09657986     A.U. after   16 cycles
 SCF Done:  E(RB+HF-LYP) =  -3193.09662030     A.U. after    9 cycles
 SCF Done:  E(RB+HF-LYP) =  -3193.09662457     A.U. after    8 cycles
 SCF Done:  E(RB+HF-LYP) =  -3193.09662526     A.U. after    6 cycles

SCF is converged but again go to first step.
I would be pleased if anyone can help me to remove this problem.
Thanks in advance.
Ehsan



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