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  • Circular Dichroism in Multiphoton Ionization of Resonantly Excited He+ Ions

    Author(s)
    Ilchen, M
    Douguet, N
    Mazza, T
    Rafipoor, AJ
    Callegari, C
    Finetti, P
    Plekan, O
    Prince, KC
    Demidovich, A
    Grazioli, C
    Avaldi, L
    Bolognesi, P
    Coreno, M
    Di Fraia, M
    et al.
    Griffith University Author(s)
    Bartschat, Klaus
    Year published
    2017
    Metadata
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    Abstract
    Intense, circularly polarized extreme-ultraviolet and near-infrared (NIR) laser pulses are combined to double ionize atomic helium via the oriented intermediate He+(3p) resonance state. Applying angle-resolved electron spectroscopy, we find a large photon helicity dependence of the spectrum and the angular distribution of the electrons ejected from the resonance by NIR multiphoton absorption. The measured circular dichroism is unexpectedly found to vary strongly as a function of the NIR intensity. The experimental data are well described by theoretical modeling and possible mechanisms are discussed.Intense, circularly polarized extreme-ultraviolet and near-infrared (NIR) laser pulses are combined to double ionize atomic helium via the oriented intermediate He+(3p) resonance state. Applying angle-resolved electron spectroscopy, we find a large photon helicity dependence of the spectrum and the angular distribution of the electrons ejected from the resonance by NIR multiphoton absorption. The measured circular dichroism is unexpectedly found to vary strongly as a function of the NIR intensity. The experimental data are well described by theoretical modeling and possible mechanisms are discussed.
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    Journal Title
    Physical Review Letters
    Volume
    118
    Issue
    1
    DOI
    https://doi.org/10.1103/PhysRevLett.118.013002
    Subject
    Mathematical sciences
    Physical sciences
    Engineering
    Science & Technology
    Physical Sciences
    Physics, Multidisciplinary
    Physics
    Photoelectron Angular-Distributions
    Publication URI
    http://hdl.handle.net/10072/409317
    Collection
    • Journal articles

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