Equation Icon  ∫ ∘ ------ ∘ ----- ˆ -1-- 𝜗∕2 -ℏωp-ˆ ℏωp-ˆ ϕ ≃ Ac 𝜗 dτ ˆas(τ ) = 2ℐ0𝜗 Y𝜗 = 2𝒲 Y𝜗. (119 ) −𝜗∕2