A numerical solution to the linearized ion Fokker-Planck equation is presented for large ionization-temperature ratio ZT_(e)/T_(i) ( ≥32). By reducing the equation to an eigenvalue problem through the moment approach, the frequencies and damping rates of ion-acoustic waves in ion-collisional plasmas are calculated as well as the specific heat ratios. Comparing our results with those calculated by Tracy et al. [Phys. Fluids, B5 (1993) 1430] shows that our method is accurate enough in large ZT_(e)/Ti plasmas.
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