# Relationship between angular momentum and spherical harmonics

I'm having a hard time grasping the logical flow from orbital angular momentum to spherical harmonics. It feels like it's just sort of been sprung out of nowhere from both my lecture notes and the textbook. Can anyone help fill in the gaps that clearly must link them somehow?

How did I get from eigenvectors of L2 and Lz being functions that depend only on theta and psi to the spherical harmonics $$|lm>=Y^{m}_{l}(\theta,\phi)$$?

Last edited:

Digging around the internet has netted me that spherical harmonics are the normalized common eigenfunction of L2 and Lz.

dextercioby
Homework Helper
I beg your pardon ? Using the abstract Dirac formalism will get you the |lm> things. But don't forget that

$$Y^{m}_{l}(\theta,\phi) = \langle r,\theta,\phi|lm\rangle$$

That is going from an abstract Hilbert space H to L2(R3,d3x) and then to spherical coordinates.

How did I get from orbital angular momentum to spherical harmonics in the first place?

dextercioby