ANALYTICAL INDEPENDENT-PARTICLE MODEL FOR ELECTRON-SCATTERING BY ARGON AT LOW-ENERGY - COMMENT

We show that values of the electron-argon scattering lengths and very low-energy phase shifts computed by Endredi and Apagyi [Few-Body Syste ms 17, 199 (1994)] in two variants of the analytical independent-parti cle model are not converged. To prove this we employ an accurate metho d of calculating the scattering lengths we proposed previously. Applie d to the model used by Endredi and Apagyi, the method combines numeric al computation of a short-range contribution to the scattering length and analytical evaluation of a long-range contribution due to the elec tron-atom polarization interaction. Outside the low-energy domain the models of Endredi and Apagyi appear reliable and the corresponding res ults are not invalidated by the present findings.