Equation Icon  2 3 3 ( 2 2 3( ) 2 2 ) n(ω ) = r+βH-ω--+ r+β-Hω-- β C − 4π- + r+-βH-m-ω- ln𝜖 . (177 ) 24 π4𝜖2 24 π4 H r+ 2 π2