The blue torus, reinforcing the assumption of the p orbital, illustrates the resulting spin up electron density.
In addition, the energy level diagram shows a net amount of two spin up electrons.
-\section[Migration of the carbon \hkl<1 0 0> interstitial]{Migration of the carbon \boldmath\hkl<1 0 0> interstitial}
+\section{Migration of the carbon interstitials}
\label{subsection:100mig}
In the following the problem of interstitial carbon migration in silicon is considered.
%\includegraphics[width=2.2cm]{vasp_mig/0-10_b.eps}
%\end{picture}
\end{center}
-\caption{Migration barriers of the \hkl<1 1 0> dumbbell to bond-centered (red), \hkl<0 0 -1> (green) and \hkl<0 -1 0> (in place, blue) C-Si dumbbell transition.}
+\caption{Migration barriers of the \hkl<1 1 0> dumbbell to bond-centered (blue), \hkl<0 0 -1> (green) and \hkl<0 -1 0> (in place, red) C-Si dumbbell transition.}
\label{fig:defects:110_mig_vasp}
\end{figure}
Further migration pathways in particular those occupying other defect configurations than the \hkl<1 0 0>-type either as a transition state or a final or starting configuration are totally conceivable.
The method in which the constraints are only applied to the diffusing C atom and two Si atoms, ... {\color{red}in progress} ...
\subsection{Migration barriers obtained by classical potential calculations}
+\label{subsection:defects:mig_classical}
The same method for obtaining migration barriers and the same suggested pathways are applied to calculations employing the classical Erhard/Albe potential.
Since the evaluation of the classical potential and force is less computationally intensive higher amounts of steps can be used.