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\textbf{Abstract}   The time-dependent density functional theory coupled with molecular dynamics is used to study electronic excitations produced by energetic protons ($\mathrm{H^+}$) in Cu over a wide range of proton velocities. A plane-wave pseudopotential scheme is employed to solve the time-dependent Kohn-Sham equations for $\mathrm{H^+}$ and Cu $\mathrm{Cu}$  crystal. These electronic excitations phenomena are used to study interatomic forces and electronic stopping powers due to both channeling and off-channeling trajectories [IS THERE OFFCHANELLING?]. Our results are in good agreement with SRIM (Stopping and Range of Ions in Matter) predictions. Also these results unveil new effects of lower velocity dependence on copper crystalline band structure. %You can get started by \textbf{double clicking} this text block and begin editing. You can also click the \textbf{Insert} button below to add new block elements. Or you can \textbf{drag and drop an image} right onto this text. Happy writing!