Hi everyone!

     Now, I want to run sorption module for adsoption of N2. I want to follow the literature that I have, but I don't know how to make N2 molecule.

The article said, ' N2 molecule was represented as a three-site model with two site located at two N atoms and the third one located at its center of mass (COM).

The site at each N atom was modeled by LJ interaction potential. The bond length between two N atoms is 1.10 x 10^(-10)m. In addition, to reproduce the measured

gas-phase quadrupole moment of N2, each N2 molecule was assigned a negative charge on each N atom (qN=-.482e) and a positive charge at the COM site (qcom=0.964).'

     Actually, I know make N2 molecule in material studio, but I don't know how to make COM site that do not have any atom. Is it possible in material studio?

Thanks,

Hyun Seung Koh