Abstract
Defrance et al (Defrance P, Kereselidze T M, Noselidze I L andTzulukidze M F 2001b J. Phys. B: At. Mol. Opt. Phys. 34 4957-68; Defrance P, Kereselidze T, Noselidze I andTzulukidze M 2001a 22nd Int. Conf. on Photonic, Electronic,and Atomic Collisions (Santa Fe, CA) (abstracts of contributedpapers) p 315) have reported calculations of theelectron-impact double-ionization cross section for helium that display a markedly different high-energy behaviour than do most ofthe published experimental data and they contend that newprecise measurements are needed. The results presented hereconfirm the correctness of the more recent experimental dataand indicate that revision of the theory is required.
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