Electron rescattering in strong-field photodetachment of ${\mathrm{F}}^{-}$

We present ab initio studies of photoelectron spectra for above-threshold detachment of ${\mathrm{F}}^{-}$ anions in short, 1300 and 1800 nm laser pulses. We identify and assess the importance of electron rescattering in strong-field photodetachment of a negative ion through comparison with an analytic, Keldysh-type approach, demonstrating the capability of ab initio computation in the challenging near-IR regime. We further assess the influence of the strong electron correlation on the photodetachment.

Figure 1

Electron momentum distributions for ATD of ${\mathrm{F}}^{-}$ in the $k_x\text{−}{k}_z$ plane for a (a) 1300 nm and (b), (c) 1800 nm laser pulse of intensity $1.3\times {10}^{13}$ W/${\mathrm{cm}}^2$. (a) and (b) are calculated using the RMT approach, while (c) is obtained using the KTA method [14]. Data can be accessed via [25].

Figure 2

Photoelectron energy spectra for ATD from ${\mathrm{F}}^{-}$ by a $1.3\times {10}^{13}\mathrm{W}/{\mathrm{cm}}^2$ pulse at 1300 and 1800 nm from the present approach, model 1 (solid, red line), model 2 (dashed, blue line), and the KTA model approach (dotted, black line). The presence of “kneelike” structures in the RMT results is a characteristic signature of rescattering.

Figure 3

Same as Fig. 2 but shown for the low-energy region on a linear scale.