From: Noel O'B. <bao...@gm...> - 2012-04-29 15:42:30
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This is a question about comp chem not obabel. If you are doing a frequency calculation (calculation of force constants), then you need to optimise the geometry first. The frequency calculation and associated thermochemistry is only valid when the gradient is zero. - Noel On 25 April 2012 18:45, Marie-Noelle Pons < mar...@en...> wrote: > Hi > It is much better. Th heat of formation is almost the same as in the > example but the next pb is : > GRADIENT NORM = 35.11809 > > ** GRADIENT IS TOO LARGE TO ALLOW FORCE MATRIX TO BE CALCULATED, > (LIMIT=10) ** > > EITHER ADD 'LET' OR REDUCE GRADIENT > USING 'TS' OR OTHER GEOMETRY OPTIMIZER > > I there something I can do with babel to solve that ? > > A+ > MN P > > > Le 25/04/2012 17:29, Noel O'Boyle a écrit : > > Hi Marie-Noëlle, > > > What exactly is T.E.S.T.? Google cannot find it. > > Without knowing, I'm guessing that you made a 2D structure. MOPAC requires > a 3D structure. Try using --gen3D to make a 3D structure. > > If there is still a problem, it means that OB has gotten the units > confused, and it's a bug on our end. If that's the case, please send us the > mol file as an attachment. > > - Noel > > On 24 April 2012 14:17, Marie-Noelle Pons < > mar...@en...> wrote: > >> Hi, I am new in using tools such as babel and mopac. I am first running >> a small test on formaldehyde. I have designed the mol file using >> T.E.S.T. from US EPA, then used babel to get from .mol to .mop in >> cartesian units. Now when I run mopac, some atoms are too close one from >> the other. I cannot see how to modify the distances within babel >> (obvkously the distances between atoms are smaller than in the mopac >> example), or is it a pb with T.E.S.T. >> Thanks for your help >> MN P >> >> -- >> Dr Marie-Noëlle PONS >> DR CNRS >> >> Laboratoire Reactions et Génie des Procédés (LRGP) - CNRS >> Université de Lorraine >> ENSIC, 1, rue Grandville BP 20451 >> F-54001 Nancy cedex, France >> >> tel: (33) 03 83 17 52 <%2833%29%2003%2083%2017%2052> 77 >> fax: (33) 03 83 32 29 <%2833%29%2003%2083%2032%2029> 75 >> e-mail: Mar...@un... >> >> >> >> >> >> >> ------------------------------------------------------------------------------ >> Live Security Virtual Conference >> Exclusive live event will cover all the ways today's security and >> threat landscape has changed and how IT managers can respond. Discussions >> will include endpoint security, mobile security and the latest in malware >> threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ >> _______________________________________________ >> OpenBabel-discuss mailing list >> Ope...@li... >> https://lists.sourceforge.net/lists/listinfo/openbabel-discuss >> > > > > ------------------------------------------------------------------------------ > Live Security Virtual Conference > Exclusive live event will cover all the ways today's security and > threat landscape has changed and how IT managers can respond. Discussions > will include endpoint security, mobile security and the latest in malware > threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ > > > > _______________________________________________ > OpenBabel-discuss mailing lis...@li...https://lists.sourceforge.net/lists/listinfo/openbabel-discuss > > > -- > Dr Marie-Noëlle PONS > DR CNRS > > Laboratoire Reactions et Génie des Procédés (LRGP) - CNRS > Université de Lorraine > ENSIC, 1, rue Grandville BP 20451 > F-54001 Nancy cedex, France > > tel: (33) 03 83 17 52 77 > fax: (33) 03 83 32 29 75 > e-mail: Mar...@un... > > > > > ------------------------------------------------------------------------------ > Live Security Virtual Conference > Exclusive live event will cover all the ways today's security and > threat landscape has changed and how IT managers can respond. Discussions > will include endpoint security, mobile security and the latest in malware > threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ > _______________________________________________ > OpenBabel-discuss mailing list > Ope...@li... > https://lists.sourceforge.net/lists/listinfo/openbabel-discuss > > |