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)
Year published
2017
Metadata
Show full item recordAbstract
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
Subject
Mathematical sciences
Physical sciences
Engineering
Science & Technology
Physical Sciences
Physics, Multidisciplinary
Physics
Photoelectron Angular-Distributions