Hi, my system is composed of two molecules, each is composed of a 36 carbon like dummy atoms i defined in the amber files (i.e., has the LJ parameters of a carbon) I'm interested in eliminating the attractive Lennard-Jones interactions between the dummy atoms , such that only the repulsive terms will account.
I thought of adding a section to the *.top file: [ nonbond params ] and to set c6 to 0 such that the attractive term of the LJ is eliminated. I used exactly the same syntax of the tutorial (page 98): * D D 1 0.00000E-00 0.34252E-05* ; (D is just the name of my dummy atom) but got a syntax error when running grompp: *Fatal error: Syntax error - File Surface_Surface_1.5_Sep_2.5.top, line 642 Last line read: '[ nonbond_params ]' Invalid order for directive nonbond_params* 1) what is wrong with my syntax? are there any further examples anywhere for the usage of [ nonbond params ] in topology files? 2) Is [ nonbond params ] the right strategy to the task i described? Many Thanks, Amir
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