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Jun 11, 2020 at 7:47 comment added Susi Lehtola sure but AFAIK Truhlar's 2004 paper was the first to propose mixing in MP2 correlation, even though they appear to have used HF orbitals for that contribution. (Using KS orbitals for both parts should be cheaper, not more expensive!)
Jun 11, 2020 at 1:03 comment added Nike Dattani - No Free Time @SusiLehtola I looked at Eqs 1 and 2 of that paper, and perhaps the $F^{\textrm{cor}}$ term resembles the last term of my Eq 1, but not quite. Grimme is using the KS orbitals to do essentially do MP2, which makes the calculation a lot more expensive, but can bring the total error down by quite a lot. The figure in my answer includes 5 double hybrids, but none of them are the 2004 one you're mentioning. I wonder why that is? It seemed this paper tried to be extremely comprehensive in including every relevant functional possible.
Jun 10, 2020 at 12:30 comment added Susi Lehtola I think double hybrids were originally proposed by Truhlar and coworkers in Zhao, Y., Lynch, B., Truhlar, D. J. Phys. Chem. A 2004, 108, 4786..
Jun 9, 2020 at 15:12 history bounty ended Eugene Chybisov
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May 30, 2020 at 15:12 history edited Nike Dattani - No Free Time CC BY-SA 4.0
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May 30, 2020 at 6:17 history answered Nike Dattani - No Free Time CC BY-SA 4.0