Journal
PHYSICAL REVIEW LETTERS
Volume 107, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.107.043002
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Funding
- Nederlandse organisatie voor Wetenschappelijk Onderzoek (NWO)
- MICINN [FIS2010-15127, ACI2008-0777, CSD 2007-00010]
- MC-ITN ATTOFEL
- European COST Action [CM0702]
- Swedish Research Council
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We report experiments where hydrogen molecules were dissociatively ionized by an attosecond pulse train in the presence of a near-infrared field. Fragment ion yields from distinguishable ionization channels oscillate with a period that is half the optical cycle of the IR field. For molecules aligned parallel to the laser polarization axis, the oscillations are reproduced in two-electron quantum simulations, and can be explained in terms of an interference between ionization pathways that involve different harmonic orders and a laser-induced coupling between the 1s sigma(g) and 2p sigma(u) states of the molecular ion. This leads to a situation where the ionization probability is sensitive to the instantaneous polarization of the molecule by the IR electric field and demonstrates that we have probed the IR-induced electron dynamics with attosecond pulses.
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