| 7:41:33 PM PDT - Tue, Apr 30th 2019 |
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The following reference from Tang, et al. may be helpful but it might be unsuitable in your case.
The Electrolyte Genome project: A big data approach in battery materials discovery.
Computational Materials Science. 103(2015) 56-67
"The results, shown in Fig. 4, demonstrate that if the frequency is very low (<39.0 cm-1), a high-accuracy frequency calculation can remove up to 42% of the imaginary frequencies. However, high accuracy re-optimization is less helpful for larger imaginary frequencies. In contrast, the two molecular geometry perturbation strategies work extremely well: they remove at least 21 out of the 24 imaginary frequencies for the whole range of imaginary frequencies."
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