VMD-L Mailing List
From: Mohan maruthi sena (maruthi.sena_at_gmail.com)
Date: Wed Sep 28 2016 - 05:19:09 CDT
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Dear FFTK experts,
I am trying to generate parameters for an
organic molecule containing 41 atoms. I have followed the FFTK
tutorial and generated charges, bond and angle parameters. I am trying
to fit dihedrals and I have not considered the dihedrals ending with
hydrogen atoms (except polar hydrogens). I have fitted the dihedrals using
simulated annealing method, the fit seems reasonably good except there
is difference in minima between quantum and fitted curve. I have
tried many ways changing various k and delta values but failed to get
the minima coinciding with QM part. Could you please provide some
insights regarding the shift in minima. Please have a look at the
plots (links provided below) containing normal and enlarged views of
minima's.
https://drive.google.com/open?id=0B9PmOOdytrUIMGNJLTJwTjlZZVE
https://drive.google.com/open?id=0B9PmOOdytrUIVXhFT29telR4ODQ
-- Thanks and Regards, Mohan Maruthi, Ph.D. student, CCNSB, IIIT-H.
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