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We investigated the two-dimensional electron momentum distributions of atomicnegative ions in an intense laser field by solving the time-dependentSchrodinger equation (TDSE) and using the first- and 2nd-order strong-fieldapproximations (SFA). We showed that photoelectron energy distributions andlow-energy photoelectron momentum spectra predicted from SFA are in reasonableagreement with the solutions from the TDSE. More importantly, we showed thataccurate electron-atom elastic scattering cross sections can be retrieveddirectly from high-energy electron momentum spectra of atomic negative ions inthe laser field. This opens up the possibility of measuring electron-atom andelectron-molecule scattering cross sections from the photodetachment of atomicand molecular negative ions by intense short lasers, respectively, withtemporal resolutions in the order of femtoseconds.

Retrieval of electron-atom scattering cross sections from laser-induced electron rescattering of atomic negative ions in intense laser fields