From NWChem
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		                        | 10:00:16 PM PDT - Mon, May 13th 2013  | 
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		                        Dear Bert, 
 
     Thank you for your reply. I have tried the options you suggested but the problem still exist. I am using NWChem 6.1.1 (which should be the latest one). Here is the information for the DIIS lshift, 
 
 
         Correlation Information 
         ----------------------- 
         Calculation type : Coupled-cluster singles & doubles w/ perturbation 
  Perturbative correction : (T) 
           Max iterations :      500 
       Residual threshold : 0.10D-05 
    T(0) DIIS level shift : 0.20D+00 
    L(0) DIIS level shift : 0.00D+00 
    T(1) DIIS level shift : 0.00D+00 
    L(1) DIIS level shift : 0.00D+00 
    T(R) DIIS level shift : 0.00D+00 
    T(I) DIIS level shift : 0.00D+00 
  CC-T/L Amplitude update :  5-th order DIIS 
               I/O scheme : Global Array Library 
       L-threshold : 0.10D-05 
       EOM-threshold : 0.10D-05 
no EOMCCSD initial starts read in 
TCE RESTART OPTIONS 
READ_INT:   F 
WRITE_INT:  F 
READ_TA:    F 
WRITE_TA:   F 
READ_XA:    F 
WRITE_XA:   F 
READ_IN3:   F 
WRITE_IN3:  F 
 
 
     Does it mean the lshift has been set correctly? If so, is there more options that I can try other than wait for the new release? 
 
 
     Thank you for your help. 
 
 
SR
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