The concept of the atomic vibrational modes opens a novel, original observation point for chemical reactions. It is clear in Fig. , that all atomic modes are subject to change with regrouping of atoms. The lowest and presumably dominating atomic mode (1) is affected by the reorganization in the narrow range near TS (-0.8<<0.8), in a typical, symmetric fashion with a minimum at TS. On the contrary, the high energy mode (5) is only slightly affected by the reaction, its gradual change covers the broadest range of the process (-1.5<<2.5). The impact of the reaction on the intermediate energy modes (2, 3, 4) is significant, though rather unexpected. The energy of the (2) mode is considerably higher than (1) mode near the reaction onset (Fig. ). The energy of (2) rapidly decays by ca. 30% at the point where the changes in (1) begin. The reverse phenomenon is observed for (3): its energy rises sharply by ca. 60% at the endpoint of the minimum at (1). The evolution of (2) and (3) modes clearly indicates their active role in the reaction. Modification of the high energy mode (4) is remarkably large and broad, covering the range (-1.5<<1.5), suggesting a minor change of rather strong bonds. Quite interestingly, the TS point seems to be significant mark for the (1) mode only.