- describe qualitative behaviour of ψ
_{n,m} - experiment: "radius" as function of charge Z

2d Coulomb as simpler version of (3d) H atom

main quantum number n (energy)

angular quantum number m < n (Lz)

change Z

problem with time evolution: boundary, center

main quantum number n (energy)

angular quantum number m < n (Lz)

change Z

problem with time evolution: boundary, center