RE: problem with geometry optimization on G03

I use the iop(2/16=3) to prevent this.  That way you don't lose orbital
 symmetry information as you would with nosymm.
 Note that sometimes the "Omega" message occurs not because the point
 group has changed but because Gaussian has for whatever reason decided to change
 the direction of the x, y, or z axes.
 --David Shobe, Ph.D., M.L.S.
 S|d-Chemie, Inc.
 phone (502) 634-7409
 fax (502) 634-7724
 Don't bother flaming me: I'm behind a firewall.
 -----Original Message-----
 From: Computational Chemistry List [mailto:chemistry-request<<at>>ccl.net] On Behalf Of Joslyn Y
 Kravitz
 Sent: Wednesday, June 22, 2005 3:13 PM
 To: chemistry<<at>>ccl.net
 Subject: CCL:problem with geometry optimization on G03
 Hello,
 You might try the NoSymmetry key word. This prevents Gaussian from assuming a
 certain symmetry for the molecule or placing it into the standard orientaion.
 Joslyn Kravitz
 On Wed, 22 Jun 2005, Ricardo Oliveira wrote:
 > Dear all,
 >
 > I have been doing optimization of silver and copper open shell
 > complexes using DFT(b3lyp), and I often get the following error
 > message:
 >
 >
 >
 > Stoichiometry    C20H20CuN4(2+,2)
 > Framework group
 > D2H[O(Cu),C2(HCN.NCH),C2'(HCN.NCH),SG(C8H8),SG"(C8H8)]
 > Deg. of freedom    22
 > Full point group                 D2H     NOp   8
 > Omega: Change in point group or standard orientation.
 >
 > Old FWG=D02H
 > [O(Cu1),C2(H1C1N1.N1C1H1),C2'(H1C1N1.N1C1H1),SG'(C8H8),SG"(C8H8)
 > New FWG=D02H
 > [O(Cu1),C2(H1C1N1.N1C1H1),C2'(H1C1N1.N1C1H1),SG(C8H8),SG"(C8H8)]
 > Error termination via Lnk1e in
 > /usr/local/g03/l202.exe at Wed Jun 15 13:48:21 2005.
 > Job cpu time:  0 days  0 hours 25 minutes  6.9 seconds.
 > File lengths (MBytes):  RWF=    188 Int=      0 D2E=
 >    0 Chk=     22 Scr=      1
 >
 > Does anyone know how to avoid this?
 >
 > Thanks
 >
 > Ricardo O Esplugas
 > Chemistry Dept
 > Sussex University
 > UK
 >
 >
 >
 >
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