The separation of variables in spherical coordinates is a rite of passage. Schiff’s problems regarding the radial wave function and the associated Laguerre polynomials are mathematically heavy. Solutions here often involve checking the normalization integrals—a tedious process where a simple sign error can derail an entire afternoon of work.
Scribd : Hosts various PDFs titled "Quantum Mechanics Problem Solutions" that cover operator expectation values and the Jacobi identity. quantum mechanics schiff solutions