Circular Dichroism in Multiphoton Ionization of Resonantly Excited He+ Ions
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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.
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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.
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Physical Review Letters
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118
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1
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© 2017 American Physical Society. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
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Mathematical sciences
Physical sciences
Engineering
Science & Technology
Physical Sciences
Physics, Multidisciplinary
Physics
Photoelectron Angular-Distributions
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Citation
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, et al, Circular Dichroism in Multiphoton Ionization of Resonantly Excited He+ Ions, Physical Review Letters, 2017, 118 (1)