prevent bond/create to its own molecule

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1

Dear Lammps users,

I tried the bond/create command trying to create a bond between cyan
color atoms (carbon at ortho and para position) and tan color atoms
(C_sp3).
After the bond created, the cyan color atom type change to blue color
atom type (C_sp2).
One problem is there are two bonds created from the brown color atom
to the blue atoms.
Is there any way to prevent creating bond to its own molecule ?

Regards,
Erik

test.png

after.png

2

You can do this via the iparam,jparam setting to fix bond/create
which effectively limit the # of new bonds that an atom can create.

Steve