Dear all, <div><br /></div><div>As part of a basis set convergence test, I gradually increase the plane wave basis set cut-off energy. The atomic system is a cluster model of methanol adsorbed in a zeolite. I isolate the system from its neighboring unit cells by using the wavelet Poisson solver. </div><div>I use a cubic box of 30 Å. The size of the system is about 21 Å in the longest direction. The atom-centered basis set is TZV2P. </div><div>When I increase the cut-off from 900 Ry to 1200 Ry, the total energy varies in a range less than 5 kJ/mol. However, when I increase the cut-off from 1200 Ry to 1260 Ry, the total energy is after 6 SCF iterations 1.38E+07 kJ/mol lower! </div><div>Because of the massively different total energy, I stopped the calculation. </div><div><br /></div><div>I have attached the output files of the two calculations. The complete input can be found at the start of the output files. </div><div><br /></div><div>What could be the cause of this behavior? </div><div><br /></div><div>Thank you very much for your help. </div><div>Please tell me if you need more information to understand the problem better.</div><div><br /></div><div>Best regards,</div><div>Torstein Fjermestad</div><div> </div>
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