  We present ab initio studies of photoelectron spectra for above threshold
detachment (ATD) of F$^-$ anions in short, 1300 nm 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.
