Dear Molpro staff and users,<br><br> I failed to perform CASPT2 (RS2C) calculations with level-shift by using Molpro 2006.1, due to no convergence in reference CI. Unfortunately, "maxiti" can't apply for RS2C calculations. How should I solve this problem?
<br clear="all"><br>End of the output:<br> NON ZERO P-SP. GR. 12265 -6.629078016776286E-007<br> -714.704330699805 -802.911282350895 0.890141097462560<br><br> NO CONVERGENCE IN REFERENCE CI AFTER 50 ITERATIONS. DEMAX=
0.13D-07 VRMAX= 0.40D-09<br> PLEASE INCREASE MAXITI AND RETRY!<br><br><br><br> Also, when I performed constraint optimization by new SLAPAF optimizer, Hessian for ANY ATOM ALWAYS is "3.57106431". Something wrong with this new optimizer? Thank you very much for your attention and any suggestion.
<br><br>-- <br>Happy New Year,<br><br>Oscar