* Please show me how to calculate the Impact parameter and Distance to the barrier. (for bcc and fcc; Calculate all directions , , and step by step). Make a table if you can. (I think this table is wrong.)

Fig. 2.7 Displacement of a lattice atom along the direction in the fcc lattice and the variation of energy of the atom with position along its path (after [5]) Table 2.1 Parameters used for the determination of Ed in the fcc lattice