Hi,
This might sound like a stupid question. I am trying to build a system with different forcefield parameters including very different masses of the atoms involved(as those are actually super-atom representation). I changed the .frc file of a particular forcefield and try typing it but was unable to do what i want. When i used amorphous builder to built a periodic system of given density the box size reflected the actual typical mass of the atoms rather than the imposed one i wanted. I was wondering if anyone can suggest me the proper procedure of doing this. Thanking in advance.

Thanks
Arnab