On 1/17/13 2:05 PM, James Starlight wrote:
Justin,

so its exacly what  I mean! I dont find any relationship between LJ
equation in any form and vdw radius of atom. But is it possible to
modify vdw radius exactly ? E.g I have  united atom as a node which
vdw must be > 1.5 A. I want to decrease it to 1 A. What should I do
for it ?


There is no term in any potential energy equation (at least, in the force fields used by Gromacs) for an explicitly defined van der Waals radius.

-Justin

--
========================================

Justin A. Lemkul, Ph.D.
Research Scientist
Department of Biochemistry
Virginia Tech
Blacksburg, VA
jalemkul[at]vt.edu | (540) 231-9080
http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin

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