Hi, Mark Abraham, I accepted your suggestion on the language. I simulated the CCl4 surface system. In order to simplify model, using the vacuum replaced the gas phase. Furthermore, I found some paper by other people also deal with the gas/liquid using the vacuum. In vacuum/CCl4, can I control the CCl4 molecule not to run to the vacuum using the gromacs? For example, using the wall, but I do not set up wall parameters well. Please give me some suggestion. Thanks again! H. Y. Xiao
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