  We present a robust, ab initio method for addressing atom-light interactions
and apply it to photoionization of argon. We use a close-coupling ansatz
constructed on a multi-configurational Hartree-Fock description of localized
states and B-spline expansions of the electron radial wave functions. In this
implementation, the general many-electron problem can be tackled thanks to the
use of the ATSP2K libraries [CPC 176 (2007) 559]. In the present contribution,
we combine this method with exterior complex scaling, thereby allowing for the
computation of the complex partial amplitudes that encode the whole dynamics of
the photoionization process. The method is validated on the 3s3p6np series of
resonances converging to the 3s extraction. Then, it is used for computing the
energy dependent differential atomic delay between 3p and 3s photoemission, and
agreement is found with the measurements of Gu\'enot et al. [PRA 85 (2012)
053424]. The effect of the presence of resonances in the one-photon spectrum on
photoionization delay measurements is studied.
