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Error functions - Stanford University

kv s q 1+k2λ2 e (31) For long wavelengths, it reduces to the usual relation ω = kv s. If we substi-tute this into the imaginary part, we get ω ≈ kv s r 1+i q πZm 2M (32) The attenuation coefficient for the ion-acoustic waves is small: γ = −ℑω = kv s s πZm 8M ≪ ℜω Neglecting V is equivalent to kV ≪ ω, i.e., V ≪ v s or T i ...

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