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We use a quantum trajectory-based semi-classical method to account forCoulomb interaction between the photoelectron and the parent ion in theclassically forbidden, sub-barrier region during strong-field tunnelingionization processes. We show that---besides the well-known modification of thetunneling ionization probability---there is also an influence on theinterference pattern in the photoelectron spectra. In the long-wavelengthlimit, the shift of the intra-cycle interference fringes caused by sub-barrierCoulomb effects in the laser polarization direction can be derivedanalytically. We compare our results with \emph{ab initio} solutions of thetime-dependent Schr\"odinger equation and find good agreement in thelong-wavelength regime, whereas the standard strong field approximation fails.We show that the nodal structure along low-order above-threshold ionizationrings is also affected by sub-barrier Coulomb effects.

Sub-barrier Coulomb effects on the interference pattern in tunneling ionization photoelectron spectra