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This paper concerns the theory of non-recollisional ionization or detachmentof atoms or ions by intense few-cycle pulses. It is shown that in certainconditions of pulse duration, peak intensity and carrier-envelope phase, theionization probability integrated over ejection angle varies almostperiodically with energy, with a period roughly equal to the photon energy forslow enough outgoing electrons. This modulation is found both in calculationsbased on the strong field approximation (SFA) and in ab initio time-dependentcalculations. It is explained as resulting from the interference between thecontributions of different saddle times of the modified classical action.Methods for efficiently calculating the SFA ionization amplitude beyond theusual saddle point approximation are also discussed.

Direct above-threshold ionization in intense few-cycle laser pulses: structures in the angle-integrated energy spectra