Date of this Version
PHYSICAL REVIEW A 98, 063407 (2018)
We study electron momentum vortices in single-photon double ionization of H2 by time-delayed, counterrotating, elliptically polarized attosecond pulses propagating along kˆ either parallel or perpendicular to the molecular axis R. For kˆ | R, kinematical vortices occur similar to those found for He. For kˆ ⊥ R, we find dynamical vortex structures originating from an ellipticity-dependent interplay of 1∑+u and 1∏+u continuum amplitudes. We propose a complete experiment to determine the magnitudes and relative phase of these amplitudes by varying pulse ellipticities and time delays.