V = E͟_͟Z͟ (?)
     r
❬r❙E,l,mₗ❭ ≝ R(𝐫) ≝ U͟(𝐫͟)
                     r

∂²/∂r² (u/r) + 2/r ∂/∂r U/r 
    = ∂/∂r (1/r (∂/∂r u) - u/r²) + 2/r ((1/r ∂/∂r u) - u/r²)

    = 1/r (∂²/∂r² u) - 2/r^2 ∂/∂r u + 2 u/r³ + 2/r² ∂/∂r u - 2u/r³

    = 1/r (∂²/∂r² u)


So,

    (-ħ/2m ∂²/∂r² + Veff(│r│)) = V(│r│) + l͟(l͟+͟1͟)ħ͟²͟
                                              2mr²
                                          |   ↓   |
                                         Centrifugal
                                           barrier