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| 1 | +(c) 2017, Thomas Frauenheim, Universität Bremen |
| 2 | +All rights reserved |
| 3 | + |
| 4 | +This work is licensed under the Creative Commons Attribution-ShareAlike 4.0 |
| 5 | +International License. To view a copy of this license, consult the LICENSE file |
| 6 | +or visit http://creativecommons.org/licenses/by-sa/4.0/ . |
| 7 | + |
| 8 | +NOTE: The rights holder(s) for this work explicitly require that the attribution |
| 9 | +conditions of this license are enforced. Use in part or in whole of this data is |
| 10 | +permitted only under the condition that the scientific background of the |
| 11 | +Licensed Material will be CITED IN ANY PUBLICATIONS ARISING FROM ITS USE. The |
| 12 | +required references are specified in this file and must be included in resulting works. |
| 13 | + |
| 14 | + |
| 15 | +SVN repository information: |
| 16 | +--------------------------- |
| 17 | +$Id: README 2007-07-9 Guishan Zheng $ |
| 18 | +$URL: $ |
| 19 | + |
| 20 | +The set has been developed for organic molecules including O, N, C, H |
| 21 | +with first row transition metal elements Sc, Ti, Fe, Co, and Ni. |
| 22 | +Tests for molecules containing atomic pairs between H/C/N/O and Sc/Ti/Fe/Co/Ni |
| 23 | +are published in JCTC07 paper. |
| 24 | + |
| 25 | +The current parameters works quite well for geometries, from which the bond lengths |
| 26 | +usualy differ from B3LYP/SDD+6-31G* (SDD for TM elements, 6-31G* for O, N, C, H) at |
| 27 | +the accuracy level of 0.06A-0.1A on average while the bond angles differ by about |
| 28 | +10-20 degree. The reaction energy values predicted by the current open-shell DFTB code |
| 29 | +on average differ about 15 Kcal/mol. The spin splitting energy is often qualitatively |
| 30 | +correct but the absolute value can be off by as large as 30-50 kcal/mol. In general, |
| 31 | +the energetics predicted by DFTB has to be taken with causion and needs more thorough |
| 32 | +tests for molecules that contain these parameterized transition metal elements. |
| 33 | + |
| 34 | +For more detailed information about the set of parameter performance, pls refer to |
| 35 | +the paper JCTC07. |
| 36 | + |
| 37 | + |
| 38 | +Relevant Publications |
| 39 | +--------------------- |
| 40 | + |
| 41 | +[JCTC07] Zheng, G.; Witek, H. A.; Bobadova-Parvanova, P.; Irle, S.; Musaev, D. G.; Prabhakar, R.; Morokuma, K.; Lundberg, M.; Elstner, M.; Kohler, C.; Frauenheim, T. J. Chem. Theory and Comput.,3(4),1349-136 (2007). |
| 42 | + |
| 43 | + |
| 44 | +Required references |
| 45 | +------------------- |
| 46 | +[JCTC07] Zheng, G.; Witek, H. A.; Bobadova-Parvanova, P.; Irle, S.; Musaev, D. G.; Prabhakar, R.; Morokuma, K.; Lundberg, M.; Elstner, M.; Kohler, C.; Frauenheim, T. J. Chem. Theory and Comput.,3(4),1349-136 (2007). |
| 47 | + |
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