IonizationEnergy:

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   Returns the ionization energy per nuclei.

   Type IonizationEnergy for a demo.
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   Form:
   e = IonizationEnergy( r )
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   Inputs
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   r        (1,1) Reactant name ('H', 'D','T','He3','B11','Li6')

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   Outputs
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   e        (1,:) Energy (eV)


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