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Date: Fri, 18 Aug 2006 07:00:00 +0200
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Forum: ADF and ADF-GUI discussions

Topic: SCF convergence problem for cyclobutadiene

LinkPost TimeAuthorMessage Excerpt
28917 Aug 2006, 05:08 PM CESTcorminb6Dear ADF experts,

I am having SCF convergence problems for D2h Cyclobutadiene.
The SCF procedure systematically converges to the wrong electronic state where the frontier molecular orbitals are incorrectly filled (flip-floped, see below). The problem is not solved when using the occupation key. Any suggestions ?

A1.g 1 2.00 -0.81623217529904E+00 -22.2108
B2.u 1 2.00 -0.59730840179994E+00 -16.2536
B3.u 1 2.00 -0.57322187315268E+00 -15.5982
A1.g 2 2.00 -0.49113456574990E+00 -13.3645
A1.g 3 2.00 -0.44690080885851E+00 -12.1608
B1.g 1 2.00 -0.35816549161258E+00 -9.7462
B3.u 2 2.00 -0.33838127205613E+00 -9.2078
B1.u 1 2.00 -0.33717109729448E+00 -9.1749
B2.u 2 2.00 -0.30772597040764E+00 -8.3737
B3.g 1 0.00 -0.15968741830555E+00 -4.3453
B2.g 1 2.00 -0.12130294696029E+00 -3.3008

thanks a lot,
Clemence


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Received on 2006-08-18 07:00:01

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