+Figure \ref{fig:defects:comb_db_01} shows the structure of these two configurations.
+The displayed configurations are realized by creating a \hkl<1 0 0> (a)) and \hkl<0 -1 0> (b)) dumbbell at position 1.
+Structure \ref{fig:defects:comb_db_01} b) is the energetically most favorable configuration.
+After relaxation the initial configuration is still evident.
+As expected by the initialization conditions the two carbon atoms form a bond.
+This bond has a length of 1.38 \AA{} close to the nex neighbour distance in diamond or graphite, which is approximately 1.54 \AA.
+The minimum of binding energy observed for this configuration suggests prefered C clustering as a competing mechnism to the C-Si dumbbell interstitial agglomeration inevitable for the SiC precipitation.
+Todo: Activation energy to obtain a configuration of separated C atoms again or vice versa to obtain this configuration from separated C confs?
+However, for the second most favorable configuration, presented in figure \ref{fig:defects:comb_db_01} a), the amount of possibilities for this configuration is twice as high.
+In this configuration the two carbon atoms are spaced by 2.70 \AA.
+The initial Si (I) and C (I) dumbbell atoms are displaced along \hkl<1 0 0> and \hkl<-1 0 0> in such a way that the Si atom is forming tetrahedral bonds with two silicon and two carbon atoms.
+The carbon and silicon atom constituting the second defect are as well displaced in such a way, that the carbon atom forms tetrahedral bonds with four silicon neighbours, a configuration expected in silicon carbide.
+The Si atom numbered 2 is pushed towards the carbon atom, which results in the breaking of the bond to atom 4.
+The breaking of the $\sigma$ bond is indeed confirmed by investigating the charge density isosurface of this configuration.
+Todo: But is this configuration beneficial for SiC prec?
+
+001 at pos 2 looks as if there is no interaction.
+There is an interaction but in the same time strain is reduced due to the opposing orientations of the defects, which leads to this low energy value.
+
+Explanation of results of defects created along <110>.
+
+-1.90 ...
+
+-2.16 ...
+
+the more far-off ones:
+-0.27 and -0.12 ...
+but better ...
+-1.88 and -1.38 ...
+
+Minimum E (reorientation) per distance
+
+Todo: Si int and C sub ...
+Todo: Model of kick-out and kick-in mechnism?
+
+Todo: Jahn-Teller distortion (vacancy) $\rightarrow$ actually three possibilities! :(