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you define the molecular surface--
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and that is a little bit of a problem
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but we'll talk about that later,
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where the molecular surface is--
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but then you put a proton at a point on it;
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and we talked about this before, for ammonium chloride.
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You put a proton on and you find--
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or no,
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it was the BNH6 we talked about the surface potential.
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Here's the same thing for O3.
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And you'll notice the surface potential is high in the middle,
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bad place to put a proton