Record Details

Title:
Circular Dichroism in Multiphoton Ionization of Resonantly ExcitedHe+Ions
Affiliation(s):
EuXFEL staff, Other
Author group:
Instrument SQS
Topic:
Scientific area:
Abstract:
ntense, 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.
Imprint:
2017
Journal Information:
Physical Review Letters, 118, 013002 (2017)
Related external records:
Language(s):
English
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