classes%5Cfall08%5C20A-1ID10%5CTheHarpoonMechanism

classes%5Cfall08%5C20A-1ID10%5CTheHarpoonMechanism - The...

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The Harpoon Mechanism These notes clarify further the class discussion. To understand better bonding in ionic bonds, like Na-Cl, let’s assume we can “lock” the electrons on each atom, so their number on each atoms does not change as we vary the distance between them. Then, we can consider two artificial cases. One has Na (neutral) interacting with CL(neutral), as a function of distance, and the electron is (artificially) not allowed to jump from Na to Cl, so that each atom is artificially held (“locked”) neutral; and the other has Na+ interacting with Cl-, as a function of distance, and here again the Na+ is artificially locked to always be positive and the Cl- artificially fixed as negative. [Of course, in reality we cannot fix the charge; what will really happen is then that for any distance R, the system will “choose” whatever form will give lower energy; i.e., if at a distance of say 6A 1 it turns out, that the ionic form (i.e., Na+ and Cl- at a distance of 6A) has lower energy
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classes%5Cfall08%5C20A-1ID10%5CTheHarpoonMechanism - The...

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