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\textbf{Abstract}   In this work we used time-dependent density functional theory coupled with molecular dynamics to study electronic excitations produced by energetic protons (H^+)  in Cu over a wide range of proton velocities. We particularly used a plane-wave pseudopotential scheme to solve the time-dependent Kohn-Sham equations for H^+ projectile in crystalline copper. These electronic excitations phenomenon is used to study the interatomic forces and electronic stopping powers due to channeling and off-channeling trajectories. Our results are in good agreement with SRIM (Stopping and Range of Ions in Matter) prediction. Also these results unveil new effects of lower velocities dependence on 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!