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  • Coherent control of D2/H2 dissociative ionization by a mid-infrared two-color laser field

    Author(s)
    Wanie, Vincent
    Ibrahim, Heide
    Beaulieu, Samuel
    Thire, Nicolas
    Schmidt, Bruno E
    Deng, Yunpei
    Alnaser, Ali S
    Litvinyuk, Igor V
    Tong, Xiao-Min
    Legare, Francois
    Griffith University Author(s)
    Litvinyuk, Igor
    Year published
    2016
    Metadata
    Show full item record
    Abstract
    Steering the electrons during an ultrafast photo-induced process in a molecule influences the chemical behavior of the system, opening the door to the control of photochemical reactions and photobiological processes. Electrons can be efficiently localized using a strong laser field with a well-designed temporal shape of the electric component. Consequently, many experiments have been performed with laser sources in the near-infrared region (800 nm) in the interest of studying and enhancing the electron localization. However, due to its limited accessibility, the mid-infrared (MIR) range has barely been investigated, although ...
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    Steering the electrons during an ultrafast photo-induced process in a molecule influences the chemical behavior of the system, opening the door to the control of photochemical reactions and photobiological processes. Electrons can be efficiently localized using a strong laser field with a well-designed temporal shape of the electric component. Consequently, many experiments have been performed with laser sources in the near-infrared region (800 nm) in the interest of studying and enhancing the electron localization. However, due to its limited accessibility, the mid-infrared (MIR) range has barely been investigated, although it allows to efficiently control small molecules and even more complex systems. To push further the manipulation of basic chemical mechanisms, we used a MIR two-color (1800 and 900 nm) laser field to ionize H2 and D2 molecules and to steer the remaining electron during the photo-induced dissociation. The study of this prototype reaction led to the simultaneous control of four fragmentation channels. The results are well reproduced by a theoretical model solving the time-dependent Schrödinger equation for the molecular ion, identifying the involved dissociation mechanisms. By varying the relative phase between the two colors, asymmetries (i.e., electron localization selectivity) of up to 65% were obtained, corresponding to enhanced or equivalent levels of control compared to previous experiments. Experimentally easier to implement, the use of a two-color laser field leads to a better electron localization than carrier-envelope phase stabilized pulses and applying the technique in the MIR range reveals more dissociation channels than at 800 nm.
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    Journal Title
    Journal of Physics B: Atomic, Molecular and Optical Physics
    Volume
    49
    Issue
    2
    DOI
    https://doi.org/10.1088/0953-4075/49/2/025601
    Subject
    Atomic, molecular and optical physics
    Theoretical and computational chemistry
    Publication URI
    http://hdl.handle.net/10072/101702
    Collection
    • Journal articles

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