Kondo temperature for the two-channel Kondo models of tunneling centers

A two-channel Kondo (2CK) non-Fermi liquid state in a metal resulting from the interaction between electrons and structural defects modeled by double- well potentials (DWP) is revisited. Account only of the two lowest states i n DWP is known to lead to rather low Kondo temperature, T-K We prove that t he contribution of higher excited states reduces T-K, if all of the interme diate states are taken into account. Prefactor in T-K is shown to be determ ined by the spacing between the second and the third levels is an element o f (3) in DWP rather than by the electron Fermi energy is an element of (F). Since is an element of (3) << is an element of (F) there is no microscopic model of movable defects which may justify 2CK phenomenology.