[CPMD-list] Problems with molecule in Oh point group

Axel Kohlmeyer akohlmey at cmm.chem.upenn.edu
Tue Aug 14 18:26:57 CEST 2007


On Tue, 14 Aug 2007, Phil McCaffrey wrote:

hi phil,

please try with symmetry 1 and turn off ISOLATED MOLECULE.

other than that, i suspect that your
input parameters with respect to convergence
of geometry and wavefunction are overdoing it.

the noise from the spline grids and due to
your gc-cutoff and generally the errors from
DFT should be larger than what you are trying
to converge to.

cheers,
   axel.

PM> Hi,
PM> 
PM> 
PM> I am having problems getting CPMD to recognise the Oh point group of my molecule. 
PM> I have tried to orient the molecule in a way that fits with the rules previously posted (given below). 
PM> However, i consistently get errors involving symmetry operations. 
PM> 
PM> I have attached the input and output files if someone could take a look it would be much appreciated
PM> 
PM>    - Positioning of the molecule:
PM>             z-axis   is the principal axis
PM>             x-axis   is the two-fold axis
PM>             xz-plane is the sigma-v plane
PM>             xy-plane is the sigma-h or the Cs symmetry plane
PM>             origin   is the center of inversion
PM> 
PM> Thanks for your time.
PM> 
PM> -Phil
PM> 
PM> 

-- 
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Axel Kohlmeyer   akohlmey at cmm.chem.upenn.edu   http://www.cmm.upenn.edu
   Center for Molecular Modeling   --   University of Pennsylvania
Department of Chemistry, 231 S.34th Street, Philadelphia, PA 19104-6323
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