  The nature of light-induced structures in attosecond transient absorption
spectroscopy of molecular systems is investigated theoretically. It is shown
how nuclear dynamics affect these structures. We find that a theoretical
three-surface model captures the main characteristics in the calculated
spectra. Based on this model, nuclear dynamics is divided into different
categories, each category having unique signatures in the absorption spectra.
Finally, we discuss the possibility for experimental observation of
light-induced structures in molecules.
