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Suppose we have a diatomic molecule whose ionization energy is $I$ and dissociation energy is $D$ such that $I>D$. Now suppose an electron with energy $E>I>D$ collides with this molecule. Which of the processes has higher probability ,the ionization or the dissociation?
Intuitively it seems that the dissociation is more probable. But I would like a justification based on quantum mechanics

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  • $\begingroup$ It may be case dependent. Energy levels and probabilities to reach them directly are independent, similarly as thermodynamic and kinetic preferences of parallel chemical reactions. Some quantum rules of forbidden transitions may apply. $\endgroup$ – Poutnik Nov 27 '20 at 15:00

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