Canted ridges

These results make the idea that the 100 2x1 reconstruction results from a high concentration of surface vacancies [78, 202] or a canted ridged structure [79] rather improbable, since in both models significant atom migration would be required for the change to 100 1 x 1 to occur. 

The same number of bonds are broken in making the double-ridge structure of part (a) as were broken in forming the simple ridge of Fig. 10-7. Such a structure will also be canted by reconstruction, as shown in part (b). This, or some variation on it, presently seems to be the most likely form of the silicon (100) surface. 

---