Thank you very much for your reply to the previous message. Now I have a new question. I want to simulate molecular diffusion properties in zeolites with lammps. In a reference, zeolites were used Hill-Sauer FF, which is a full atomic force field, but the absorbates (methane) was modeled as a spherical united atom with zero net charge. Only CH4-CH4 and CH4-framework interactions are defined using LJ potentials. I don't know how to write the .in file that contains two different scales of force field. Could you give me a simple example? Thank you very much.
The potential parameters are below.