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[bug] Error in Bohdansky sputtering yield formula in formulas.py #244

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@drobnyjt

Description
In the Bohdansky formula located in scripts/formulas.py, the factor R_Rp, which is R/Rp, should instead be (R_Rp)^(-1), that is, Rp/R.

Additional context
Interestingly, for many targets this makes the results of the original Bohdansky formula significantly worse. Later versions swapped out the prefactor in the formula with an empirical one. It might be worth using the 'revised' Bohdansky formula from Garcia-Rosales et al. instead of the original Bohdansky one.

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