On 1/18/18 12:38 AM, kordza...@aut.ac.ir wrote:
Hi all

when we use "gmx energy" what is the difference between LJ-(SR), 
LJ-14, Coulomb-14, Coulomb(SR)?

those mentioned energies, give us energy interaction of total system. right?

Not necessarily, because there may be long-range terms from PME or dispersion correction.

if I want to determine interaction enenrgy for example, LJ, between two special 
species, not in total system, what should I do?

Define energygrps in the .mdp file and re-evaluate the energies of the trajectory with mdrun -rerun. Note that for most force fields, this value has no physical significance.

-Justin

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Justin A. Lemkul, Ph.D.
Assistant Professor
Virginia Tech Department of Biochemistry

303 Engel Hall
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Blacksburg, VA 24061

jalem...@vt.edu | (540) 231-3129
http://www.biochem.vt.edu/people/faculty/JustinLemkul.html

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