Abstract

A recent treatment of the saturation drift velocity ${v}_{\mathrm{sat}}$ of electrons in dense, supercritical argon [Leycuras and Levesque, Phys. Rev. A 32, 1180 (1985)] gives positive values of ${\mathrm{dv}}_{\mathrm{sat}/\mathrm{dn}}$ at n/${n}_{c}$=1.2\char21{}1.6, whereas the experimental values are negative in both the supercritical gas and the liquid at these densities [Jahnke, Meyer, and Rice, Phys. Rev. A 3, 734 (1971); Huang and Freeman, Phys. Rev. A 24, 714 (1981)]. Other difficulties are mentioned.

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