Eng 45 - Chapter 1 - Structure(26)

Eng 45 - Chapter 1 - Structure(26) - Materials Scien ce...

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Materials Science Fall, 2007 Page 25 W = V(r 2 ) - V(r 1 ) 2.4 The potential energy is plotted and labeled in Fig. 2.7. It has a singularity at the position of the nucleus, and increases rapidly as the electron separates from it. The bound electron states of the atom have negative energies, E, with the consequence that electrons in these states cannot escape from the atom unless additional energy is added. The energies of the bound electrons are quantized into a sequence of discrete values, or energy levels, such as those indicated by the horizontal lines in the figure. These levels are separated by energy gaps that represent ranges of energy that an atomic electron cannot have. Electrons with positive energies are free to escape from an isolated atom and can have any energy. They may occupy any one of the continuum of unbound electron states indicated in the diagram. E
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Eng 45 - Chapter 1 - Structure(26) - Materials Scien ce...

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