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<p>Dear all,</p><p> </p><p>I am trying to calculate doubly excited states of linear acenes starting from naphthalene at the MP2, MP3, MP4, CCSD, CCSD(T) level.</p><p>All the time I am facing the "unreasonable norm" problem. Until now I have used , SHIFT option for CCSD and CCSD(T) but problem still occurs. I also set _CC_NORM_MAX=2.0 but in this case I got strange results for the MP2, MP3, MP4 . they are lower in energy than CCSD and CCSD(T).</p><p>Any help to fix this problem would be appreciated. </p><p> </p><p>Best regards</p>
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