Journal
PHYSICAL REVIEW LETTERS
Volume 118, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.118.013002
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Funding
- Volkswagen Foundation
- Light induced dynamics and control of correlated quantum systems at the University of Hamburg [SFB 925]
- Elettra within the CALIPSO Transnational Access Programme
- European XFEL
- DIPC
- programme Physics with Accelerators and Reactors in Western Europe of the Russian Ministry of Education and Science
- United States National Science Foundation [PHY-1403245]
- XSEDE supercomputer allocation [PHY-090031]
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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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