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  • Time-resolved Coulomb-explosion imaging of nuclear wave-packet dynamics induced in diatomic molecules by intense few-cycle laser pulses

    Author(s)
    Bocharova, IA
    Alnaser, AS
    Thumm, U
    Niederhausen, T
    Ray, D
    Cocke, CL
    Litvinyuk, IV
    Griffith University Author(s)
    Litvinyuk, Igor
    Year published
    2011
    Metadata
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    Abstract
    We studied the nuclear dynamics in diatomic molecules (N2 , O2 , and CO) following their interaction with intense near-IR few-cycle laser pulses. Using Coulomb-explosion imaging in combination with the pump-probe approach, we mapped dissociation pathways of those molecules and their molecular ions. We identi?ed all symmetric and asymmetric breakup channels for molecular ions up to N5+ 2 , O4+ 2 , and CO4+ . For each of those channels we measured the kinetic energy release (KER) spectra as a function of delay between the pump and probe pulses. For both N2 and O2 the asymmetric (3,1) channel is only observed for ...
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    We studied the nuclear dynamics in diatomic molecules (N2 , O2 , and CO) following their interaction with intense near-IR few-cycle laser pulses. Using Coulomb-explosion imaging in combination with the pump-probe approach, we mapped dissociation pathways of those molecules and their molecular ions. We identi?ed all symmetric and asymmetric breakup channels for molecular ions up to N5+ 2 , O4+ 2 , and CO4+ . For each of those channels we measured the kinetic energy release (KER) spectra as a function of delay between the pump and probe pulses. For both N2 and O2 the asymmetric (3,1) channel is only observed for short (<20 fs) delays and completely disappears after that. We interpret this observation as a signature of electron localization taking place in dissociating molecular tri-cations when their internuclear separation reaches about 2.5 times the equilibrium bond length. This is a direct con?rmation that electron localization plays an essential role in the universal mechanism of enhanced ionization in homonuclear diatomic molecules. Using classical and quantum mechanical simulations of the time-dependent KER spectra, we identify the pathways and intermediate states involved in the laser-induced dissociation of those molecules.
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    Journal Title
    Physical Review A (Atomic, Molecular and Optical Physics)
    Volume
    83
    Issue
    1
    DOI
    https://doi.org/10.1103/PhysRevA.83.013417
    Subject
    Mathematical sciences
    Physical sciences
    Atomic and molecular physics
    Chemical sciences
    Publication URI
    http://hdl.handle.net/10072/40882
    Collection
    • Journal articles

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