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Is the exponential (repulsive) term in Born-Mayer potentials supposed to beexp(-r)orexp(1/r)? -ris the interatomic distance; constants ignored

I've seen both versions pop up in what appear to be reputable sources. The second one seems to be more popular, but, to me at least, the first one seems to make more sense (goes to infinity atr=0).

Which one is the right one and why?

Thanks

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# Repulsive term in Born-Mayer potentials

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