Attosecond dynamics in simple molecular systems

Isolated attosecond pulses have been used to excite and ionize H$_{2}$ and D$_{2}$ molecules. The interplay among the large variety of states of the neutral molecule and of the molecular ion that can be accessed, determines a complex dynamics that can be probed using a synchronized infrared field. A complete quantum mechanical calculation including nuclear and electronic wave-packets has been applied to interpret the experimental outcome. In the analysis particular attention will be devoted to the role of the doubly excited states of H$_{2}$/ D$_{2.}$