Understanding the construction of vector spherical wave functions!! Hi guys, I'm looking at electromagnetic scattering just now, and in particular, how multipole fields are constructed and then how the wavefunctions are represented as the incident, internal and scattered fields. When you satisfy the vector Helmholtz equation, you get three independent vector solutions to it, typically described as L, M, and N. However, when you get to the final expressions for wavefunctions, they are described in terms of multipole fields M and N. What does happen to L and what does it represent? I'll appreciate any feedback on this strange question. Thanks.