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2.2 Indeks bias dengan model elektronMisalkan medan listrik yang mengenai atom:E=E o eiωtKarena keelastisan elektron, persamaan geraknya:2d x dx 2m + mγ+ mωox = −eEoe2dt dtx=posisi elektron relatif terhadap inti atom, m=massa elektron, ω o= frekuensieigen dari elektron, γ=koefisien redaman.iωtSolusi stasioner:x=− eE2 2m(ω −ωiγω)o+Momen dipol terinduksi:p= −ex=2eE2 2m(ω −ω+ iγωo)Jadi, polarizabilitas atom:α =2m(ωe22o−ω+iγω)11

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