Quantum Theories of Solids
From the foregoing, it can be seen that for n atoms forming a molecule, there will be n energy levels, each slightly different; and as n gets larger, the separation in energy between the levels becomes progressively smaller. It is obvious that as n is increased, the computations involved in a solution of the wave equation become less manageable. Simplifying assumptions must be made. There are essentially two approaches to the problem.
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