  Within the color dipole gBFKL dynamics applied to the diffraction slope we
predict an anomalous t dependence of the differential cross section as a
function of energy and Q^2 for production of radially excited V'(2S) light
vector mesons in contradiction with a well known standard monotonous t-
behaviour for V(1S) mesons. The origin of this phenomenon is based on the
interplay of the nodal structure of V'(2S) radial wave function with the energy
and dipole size dependence of the color dipole cross section and of the
diffraction slope. We present how a different position of the node in V'(2S)
wave function leads to a different form of anomalous t- behaviour of the
differential cross section and discuss a possibility how to determine this
position from the low energy and HERA data.
