Intermolecular friction symbol derived from crystal information

Intermolecular friction (IF) is an important but unclear concept in the material world. We propose intermolecular friction symbols (IFSs) to straightforwardly and roughly evaluate IF in crystal bulks and introduce a method for plotting them in terms of the close contacts among an assigned molecule and its neighbors in lattice. Also, we confirm that the IFS is a simple and efficient tool to understand experimental observations related to IF, by applying successfully it to assess impact sensitivity of explosives.