Finding Quantum numbers from wavefunction

[andre220]

Homework Statement

Consider a spinless particle in a central field in a state described by:
\psi_a(r) = (x^2 - y^2) e^{-\alpha r^2}
\psi_b(r) = xyz e^{-\alpha r^2}

Find quantum numbers l and l_z (or their appropriate superposition) for these two cases.

Homework Equations

\psi(r) = \psi(r, \theta, \phi) = R(r)Y(\theta, \phi)

The Attempt at a Solution

Okay so I am not sure where to start with this problem, I could construct the Schrodinger equation in terms of the radial and spherical harmonics and then we know that l can be determined from this equation, yet I do not know what the potential for such equation should be.

 

[vela]

You don't need to use the Schrodinger equation. Express the wave functions in spherical coordinates and separate it into an angular part and a radial part. You want to express the angular part as a linear combination of the spherical harmonics.