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To know the energy values-marked as ? and the coordinates-x,y for a given reaction coordinate diagram for a metal Mas shown below.

Reading on wiki, I came to know that the reaction coordinate diagram is derived from a potential energy surface (PES).

I would appreciate if you could also direct me to a handbook or any such resource which is well equipped with numerical data for Energy Profile of pure elements.

I would then calculate the symmetry factor $\alpha$ as ,

$$\alpha_c = {\frac{y}{x+y}}$$
$$\alpha_a = {\frac{x}{x+y}}$$

and then substitute it in the Butler-Volmer equation.


Please point out my conceptual errors ( I am sure there are many) in my understanding here

Energy Profile

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  • $\begingroup$ You should mention the presence and position of the electrons accompanying $M^{2+}$ $\endgroup$ – Maurice Feb 16 at 16:01
  • $\begingroup$ Did not understand. What do you mean by presence and position ? And extremely sorry it is for any general M --> Mn+ ne- $\endgroup$ – kedar Feb 16 at 16:38
  • $\begingroup$ Does such a diagram make any sense for ionising an atom or a molecule? Is there a reaction partner or is ionisation a result of excitation, is this in the gas phase or solution? $\endgroup$ – porphyrin Feb 16 at 17:59
  • $\begingroup$ @porphyrin Oh, right. This is a half-cell reaction (most probably an oxidation one). It can be considered to be Redox reaction taking place in a liquid electrolyte. Now, not really sure on it making sense, as reaction coordinate is an abstract one-dimensional coordinate which represents progress along a reaction pathway. $\endgroup$ – kedar Feb 16 at 18:06