  We revisit the definition of the probability current for the Schrodinger
equation. First, we prove that the Dirac probability currents of stationary
wave functions of the hydrogen atom and of the isotrop harmonic oscillator are
not nil and correspond to a circular rotation of the probability. Then, we
recall how it is necessary to add to classical Pauli and Schrodinger currents,
an additional spin-dependant current, the Gordan current. Consequently, we get
a circular probability current in the Schrodinger approximation for the
hydrogen atom and the isotrop harmonic oscillator.
