convergence on IPCM



Dear Sir:
 When I using IPCM in Gaussian98 to do single point calculation
 ,I find that the convergence of can not be reached.
 "the Largest difference in charges from previous cycle"
 do not change.My model is a hydrigen bond system.I use DFT method.
 what hint can you give me to solve the problem?
 thank you
 chenhui
 dept chemistry Nanjing univ
 P.R.China
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