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Homework Help: Normalization of radial Laguerre-Gauss

  1. Nov 30, 2011 #1
    1. The problem statement, all variables and given/known data

    Normalization of radial Laguerre-Gauss

    Normalize [tex] \Psi _n (r) = h_n L_n (2\pi r^2) e^{-\pi r^2} [/tex]

    2. Relevant equations

    [tex]\int _0 ^{\infty} e^{-x} \, x^k \, L_n ^{(k)} (x) \, L_m ^{(k)} (x) dx = \frac{(n+k)!}{n!} \delta _{m,n} [/tex]

    3. The attempt at a solution

    [tex]1 = \int _0 ^{\infty} \Psi _m ^{\ast} (r) \Psi _n (r) dr = \int _0 ^{\infty} h_m ^{\ast} L_m (2\pi r^2) e^{-\pi r^2} h_n L_n (2\pi r^2) e^{-\pi r^2} dr [/tex]

    If I let [itex] x = 2\pi r^2[/itex], then I get [itex] dx = (4\pi r) dr[/itex]. The radial dependence bothers me. I think there's a step I'm missing out.
  2. jcsd
  3. Nov 30, 2011 #2
    Just realized [itex]dx[/itex] is not an issue. I don't need to substitute it by a [itex]dr[/itex], so there's no problem. All I need to do is replace [itex]2\pi r^2[/itex] by [itex]x[/itex]. I'm done.
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