The spherical harmonics are the angular portion of the solution to Laplace's equation in spherical coordinates. They are given by
where is the associated Legendre function.
The first few spherical harmonics are given by:
- M. E. Rose "Elementary theory of angular momentum", John Wiley & Sons (1967) Appendix III
- I. Nezbeda, J. Kolafa and S. Labík "The spherical harmonic expansion coefficients and multidimensional integrals in theories of liquids", Czechoslovak Journal of Physics 39 pp. 65-79 (1989)