deletions | additions       diff --git a/Figure_ref_fig_force_on_neighbor_shows__.tex b/Figure_ref_fig_force_on_neighbor_shows__.tex  index 924d89a..d7afc36 100644  --- a/Figure_ref_fig_force_on_neighbor_shows__.tex  +++ b/Figure_ref_fig_force_on_neighbor_shows__.tex 
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Figure \ref{fig:force_on_neighbor} shows the radial force exerted on a neighboring Cu atom closest to the projectile (H^+) trajectory as a function of parallel distance to the projectile at different projectile velocities along the [100] channeling trajectory. The forces on the nuclei are evaluated from the time-dependent electron density n(\textbf r, t). The force is obtained by the application of the Hellmann-Feynman theorem\cite{1941}\cite{Feynman_1939} but not applied to the ground state in this case.  The adiabatic force is recovered for $v=0a.u.$ with no oscillations as expected. The maximum value for the force is obtained at the closest distance between H^+ and neighbor Cu atom. As the proton moves further away from the Cu atom, the force decreases significantly and eventually goes to zero. As the velocity increases the position of the maximum value of the force shifts due to the complex structure obtained by the shape of the curves and oscillations are created. These oscillations becomes persistent as the velocity of the proton increases.