I have found an expression for the estimated energy contribution a term |I> will bring to a wavefunction |K>(adsbygoogle = window.adsbygoogle || []).push({});

[itex]\Delta E = \frac{|\langle I|\hat{H}| K\rangle|^2}{(E_K - \langle I |\hat{H}| I\rangle)}[/itex]

Is there a simple way to extract the coefficient that will be associated with |I>? Even a link to relevant literature would be appreciated.

Thanks

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# 2nd Order Perturbation Coefficients.

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