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A possible route to extract electronic and nuclear dynamics from moleculartargets with attosecond temporal and nanometer spatial resolution is to employrecolliding electrons as `probes'. The recollision process in molecules is,however, very challenging to treat using {\it ab initio} approaches. Even forthe simplest diatomic systems, such as H$_2$, today's computationalcapabilities are not enough to give a complete description of the electron andnuclear dynamics initiated by a strong laser field. As a consequence,approximate qualitative descriptions are called to play an important role. Inthis contribution we extend the work presented in N. Su\'arez {\it et al.},Phys.~Rev. A {\bf 95}, 033415 (2017), to three-center molecular targets.Additionally, we incorporate a more accurate description of the molecularground state, employing information extracted from quantum chemistry softwarepackages. This step forward allows us to include, in a detailed way, both themolecular symmetries and nodes present in the high-occupied molecular orbital.We are able to, on the one hand, keep our formulation as analytical as in thecase of diatomics, and, on the other hand, to still give a complete descriptionof the underlying physics behind the above-threshold ionization process. Theapplication of our approach to complex multicenter - with more than 3 centers,targets appears to be straightforward.

Above-threshold ionization (ATI) in multicenter molecules: the role of the initial state