<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;">hai,<br><br>Dear Molpro-User:<br><br>I want to calculate the excitation energy of the first two excited singlet<br>states of para-difluorobenzene molecule. The point group of this molecule<br>is D2h. And the corresponding excited state symmetry is 1B2u (S0) and 1B1u<br>(S1), respectively. When i ran the job it is calculating the excitation<br>energy of the first state but for the second state it failed with the<br>following error message.<br><br>" EOM-CCSD FOR 1 EXCITED STATES OF SYMMETRY 5 STATES: 1<br><br><br> Iter. Vector |HC-EC| E_new-E_old Excitation energy Total<br>energy<br><br><br> Record 6064.8 too small: 1307484 1315332<br> ? Error<br> ? Record too small (kcp)<br> ? The problem occurs in
cckext<br><br> ERROR EXIT<br> CURRENT STACK: MAIN "<br><br>The following is the input, i have used for this Job.<br><br><br>***,p-c6h4f2 eom-ccsdt calculation<br>print,orbital;<br>memory,300,m<br>basis{f=aug-cc-pvdz,c=aug-cc-pvdz,h=cc-pvdz}<br>geomtyp=xyz;<br>geometry={12<br>para-difluorobenzene eom-ccsd(t) calculation (single point calculation)<br>c 0.000000 0.000000 1.374968<br>c 0.000000 1.227353 0.703641<br>c 0.000000 1.227353 -0.703641<br>c 0.000000 0.000000 -1.374968<br>c 0.000000 -1.227353 -0.703641<br>c 0.000000 -1.227353
0.703641<br>h 0.000000 -2.160684 -1.270973<br>h 0.000000 -2.160684 1.270973<br>f 0.000000 0.000000 -2.742767<br>h 0.000000 2.160684 -1.270973<br>h 0.000000 2.160684 1.270973<br>f 0.000000 0.000000 2.742767<br>end}<br>rhf;occ,8,2,5,1,7,2,4,;wf,58,1,0;<br>save,2130.3<br><br>multi;occ,9,2,6,1,8,2,4;closed,8,1,5,,7,1,4,;<br>start,2130.3;<br>wf,58,1,0;wf,58,3,0;wf,58,5,0;<br>ccsd(t)<br>eom,1.1,1.3,1.5<br>put,molden,p-c6h4f2.molden;<br>exit<br><br>Can anyone please help me to resolve the problem?<br><br>Thank you in advance.<span style="color: rgb(255, 64, 64); font-style:
italic;"> Rajagopala Reddy.Seelam</span><br><div style="text-align: right;"><span style="color: rgb(255, 64, 64);"></span></div></td></tr></table><br>
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