Discrete Models

In some problems the states that mix in a significantModello LCAO way are few; then, the method of matrices lends itself to insightful (if qualitative) descriptions. The simplest model is \(2 \times 2\) : \( H = \left( \begin{array}{ll} E_{a} & V, \\ V^{*} & E_{b} \end{array} \right) . \)