Probing long-range Coulomb interaction in tunnel ionization with elliptically polarized light

We present experimental data that shows significant deviations from theoretical predictions for the location of the center of the electron momenta distributions at low values of ellipticity of laser light. We show that these deviations are caused by significant Coulomb focusing along the minor axis of polarization. By investigating ellipticity-resolved electron momenta distributions in the plane of polarization, we show that Coulomb focusing predominates at lower values of ellipticity of laser light, while Coulomb asymmetry becomes important at higher values, showing that these two complementary phenomena can be used to probe long-range Coulomb interaction at all polarizations of laser light.