 Rayleigh plane-wave expansion

ID: rayleigh-plane-wave-expansion

e^{i k \cdot x} = 4 π \sum_{ℓ m} i^{ℓ} j_{ℓ} (k r) Y_{ℓ m}^{*} (k) Y_{ℓ m} (x),

where

j_{ℓ}

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