Symmetry reversals in resonant enhancement

The disturbance which results from superposing this new perturber on a Rydberg manifold is extremely similar to the disturbance caused when 

Following [471], we choose hu to lie near a p state n = N and 2hu near a d state n2 — n and then rewrite T(u) to display these states explicitly  

We can further generalise these expressions to include an explicit summation over many levels of the Rydberg manifold n. To display energy variations more directly, it is convenient also to set Eq — 0 and E — hu and to write E00 for the series limit. Finally, we have 

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