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Tunneling ionization is one of the fundamental electron dynamics, which haswide applications in ultrafast physics. When frustrated tunneling ionization(FTI) is considered, the tunneling rate is not equivalent to ionization rate.However, it is hard to resolve the effects of FTI and direct tunnelingionization (DTI) in ionization spectrum experimentally. Here we report thefirst observation of the asymmetrical fast oscillation in above-thresholdionization (ATI) spectrum of Argon as function of carrier-envelope phase (CEP),to the best of our knowledge. Simulation results identify that in theexperimental ATI spectrum, the {\pi}/5 oscillation originates from the quantuminterference of electrons in FTI, while DTI is responsible for the asymmetry.Our results provide clear evidence to resolve the effects of direct tunnelingand FTI in a new physical regime.

Resolved frustrated tunneling ionization in asymmetrical fast oscillation of above-threshold ionization spectrum