Figure 1

(Color online) Laser-dressed total photoelectron spectrum for an autoionizing state created in $\mathrm{xuv}+\mathrm{ir}$ laser fields. The spectra from the strong field approximation and from the numerical calculations are shown to agree with each other. The electron spectrum in the absence of lasers is also shown. See text for the parameters used in the calculation.Reuse & Permissions

Figure 2

(Color online) Streaked electron spectra in the forward direction for two Lorentz resonances of lifetime of (a) $0.2\mathrm{fs}$ and (b) $2\mathrm{fs}$, excited by a $0.5\text{−}\mathrm{fs}$ xuv pulse. The xuv-laser delay time is zero and two carrier envelope phases are shown: 0 (solid) and $\pi$ (dashed). For other parameters used, see text. (c) Streaked electron spectra (black) for a Fano resonance at different time delays. Also shown are the electron spectra of the Lorentz resonance alone [in red (dark gray)] and the photoionization alone [in green (gray)]. Parameters for the resonance, the xuv, and the laser are as in Fig. 1.Reuse & Permissions

Figure 3

(Color online) (a) Electron counts in the forward direction for a Lorentz resonance within the first sideband (20.4, 22.1) eV vs time delay, shown for two carrier envelope phases of the laser and the counts after phase average. (b) Similar electron counts for a Fano resonance for electrons within the energy of (20.4, 22.1) eV. The smooth curve gives the counts for the corresponding Lorentz resonance part, except vertically shifted by a constant.Reuse & Permissions

Figure 4

(Color online) (a) Streaked electron spectra within the first sideband vs time delay for two nearby Lorentz resonances excited by an attosecond pulse. (b) The oscillatory total electron counts within the sideband vs time delay can be fitted to extract the lifetimes of the two resonances and their energy separation (see text).Reuse & Permissions