what's the value of energy-conversion constant in lammps

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Dear Prof. Kohlmeyer,

Thanks for your reply.

In lammps, if the unit was real, I calculated the energy-conversion constant C as:

C82E6A70@...5907....jpg

I’m confused by the formula for potential in some MD paper based on LAMMPS. The interaction between atomic sites are expressed as

C92E6A70@...5907....jpg

For the Coulombic potential, It seems that both of the energy-conversion constant C and the dielectric constant equal 1, which is different with my result. I don’t whether I have made a mistake, so I hope you can give me some explanation.

Thanks!

Zhang Chao