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I have the following problem:

To calculate the fine structure energy corrections for the hydrogen atom, one has to calculate the expectation value for (R,R/r^m), where R is the solution of the radial part of the schroedinger equation (i.e. essentially associated laguerre polynomial) and m=1,2,3.

[tex]\int_{0}^{\infty} {dx} {(\mathrm{L}_n^k)}^2e^{-x}x^{k+1-m}[/tex]

Solving the integral for n=1 is easy because the laguerre polynomials are normalised that way.

For m=2,3 it is much harder. I have already spent a few hours trying to get a solution by using the generating function of the laguerre polynomials, but no luck yet. Can anybody give me a hint how to do it?

Thx

Sebastian

Edit:

Can anybody tell me how to post latex in this forum pls. Sorry for my stupidity, but I just don't get it.

Edit 2: Thx for the help on latex Statuts X. Added integral to the post.

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# Integrating Laguerre Polynomials - Fine structure hydrogen

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