Open shoubhikraj opened 3 years ago
Hello, You are struggling with an acknowledged difficult part of GAMESS input. GAMESS tolerance for generating symmetry dependent atoms is very tight so coordinates have to be nearly perfect to be accepted. I will take a look to see if increasing the number of digits in the coordinates helps. Otherwise the recommended way to get around the issue with GAMESS is to choose a lower order point group. In the Determine Point group dialog you can adjust the slider to the left which will lower the number of groups that match. I thought the default was similar to GAMESS, but will have to verify.
Hi,
I am trying to build an input file for a ferrocene molecule with D5d point group. I build the structure by hand, optimised it with semi-empirical xTB, and then opened the
.xyz
file with wxMacMolPlt.After that, I used the "Determine Point Group" option from the "Molecule" menu. Setting the tolerance to low gave D5d as an option, so I selected it and pressed "Set Point Group". Then I wrote the input file with unique Cartesian coordinates for GAMESS.
The input file is:
The input file when opened with wxMacMolPlt, shows the correct structure of ferrocene.
On running the input file, GAMESS runs into error. It seems that imposing the symmetry has some kind of bug/issue, so that GAMESS is generating extra carbon atoms than there is in the actual molecule. The error message is:
So as can be seen, GAMESS is generating 20 carbon atoms by symmetry operations, whereas there should be 10 carbon atoms.
This problem appears most often for point groups with higher symmetry like D4h, D4d, Td, Oh etc.
Version: wxMacMolPlt v7.7 OS: Windows 10, 64 bit