Title: Above-threshold ionization (ATI) in multicenter molecules: the role of the initial state,
Abstract: A possible route to extract electronic and nuclear dynamics from molecular
targets with attosecond temporal and nanometer spatial resolution is to employ
recolliding electrons as `probes'. The recollision process in molecules is,
however, very challenging to treat using {\it ab initio} approaches. Even for
the simplest diatomic systems, such as H$_2$, today's computational
capabilities are not enough to give a complete description of the electron and
nuclear dynamics initiated by a strong laser field. As a consequence,
approximate qualitative descriptions are called to play an important role. In
this contribution we extend the work presented in N. Suárez {\it et al.},
Phys.~Rev. A {\bf 95}, 033415 (2017), to three-center molecular targets.
Additionally, we incorporate a more accurate description of the molecular
ground state, employing information extracted from quantum chemistry software
packages. This step forward allows us to include, in a detailed way, both the
molecular 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 the
case of diatomics, and, on the other hand, to still give a complete description
of the underlying physics behind the above-threshold ionization process. The
application of our approach to complex multicenter - with more than 3 centers,
targets appears to be straightforward.