I am using LANL2DZ for Sn and 6-31g for C, H, O atoms but it's running for a long time. To avoid this i wanted to do some quick calculation (and reduce computational cost), just to get the optimzed structure. Can any one tell me which ECP basis set will be better to do the calculations?
If you need smaller ecp basis set, try to use LanL2MB.
I recommend you to change functional or 3-21G basis set of C H O
I've read your previous question.
You defined scf=qc option at route section.
This is the reason why the calculation is so slow.
If you still use qc option, please delete the qc option then try to calculate.
If you only need to get optimized structure, just try with small basis set. 3-21G is ok for that. On the other hand, try with semi empirical methods. Results is not much more accurate, but you can get some idea. It also reduce your cpu time and cost. You also can try with Pseudopotential basis set for Sn.
This paper may help you that.
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