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In this approach, we keep the C-O(a) distance fixed at preselected values, and minimize the total energy with respect to all remaining orthogonal degrees of freedom. In particular this means that the molecules are free to rotate and translate subject to the above constraint, and in addition the surface Pt atoms are allowed to relax. The transition state (TS) is identified by requiring (a) that the ionic forces at the TS vanish and (b) that the TS is a maximum along the reaction coordinate [i.e., C-O(a) distance], but a minimum with respect to all remaining degrees of freedom. The resulting pathway gave a smooth passage from the initial to final state, which is shown in a series of snapshots in Fig. 2.

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