  The formation of Correlated Electron Pairs Oscillating around the Fermi level
in Resonant Quantum States (CEPO-RQS), when a metal is cooled to its critical
temperature T=Tc, is studied. The necessary conditions for the existence of
CEPO-RQS are analyzed. The participation of electron-electron interaction
screened by an electron dielectric constant of the form proposed by Thomas
Fermi is considered and a physical meaning for the electron-phonon-electron
interaction in the formation of the CEPO-RQS is given. The internal state of
the CEPO-RQS is characterized by taking into account the internal Hamiltonian,
obtaining a general equation that represents its binding energy and depends
only on temperature and critical temperature. A parameter is also defined that
contains the properties that qualitatively characterizes the nature of a
material to form the CEPO-RQS.
