Fig. 2.

Theory of attosecond VUV coherent control of H₂ ionization/dissociation channels. (A–C) As the central photon energy of the VUV harmonics is blue-shifted from an effective driving laser wavelength of 784 nm to 740 nm, the total ionization yield switches to half-cycle periodicity due to different electronic wave packet interferences, thus demonstrating attosecond coherent control over the interfering electron wave packets and ionizing pathways in molecules.