2023-11-09 Force Field Release Meeting notes

 Date

Nov 9, 2023

 Participants

  • @Lorenzo D'Amore

  • @Brent Westbrook

  • @Christopher Bayly

  • @David Mobley

  • @Chapin Cavender

  • @Alexandra McIsaac

  • @Matt Thompson

  • @Pavan Behara

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 Discussion topics

Item

Notes

Item

Notes

Interaction energies (LDA)

  • Slides will be uploaded

  • LW: which backend did you use to assign charges?

    • LDA: Ambertools, using input geometry

  • CBy: So this dataset includes mixed dimers at a variety of distances?

    • LDA: yes, and this dataset includes MD snapshots so there’s a variety of conformers

    • CBy: with neutral dimers, if there’s a lone pair involved (e.g. pyridine) and you had it in a dimer with a donor (e.g. water, pyrrole), you could look at it in the plane with the lone pair (which should be favourable), or out of the plane, where pt charges would overstabilize it but vsites would show improvement there

    • LDA: I’ll look whether there are suitable conformations

    • CBy: a surrogate would be the interaction energy itself for such dimers. This work could be quite valuable for motivating virtual sites, which might improve accuracy. Could also be valuable for validating or parameterizing vdW interactions and polarizability efforts

    • LDA: as soon as a virtual site model is available it could be used in the workflow

  • PB: Did you also try with the double-exp FF?

    • LDA: would like to do that next, I understand they did work with the S66 dataset but it’s all neutral

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 Action items

 Decisions