Circular Dichroism in Multiphoton Ionization of Resonantly Excited He+ Ions

M. Ilchen, N. Douguet, T. Mazza, A. J. Rafipoor, C. Callegari, P. Finetti, O. Plekan, K. C. Prince, A. Demidovich, C. Grazioli, L. Avaldi, P. Bolognesi, M. Coreno, M. Di Fraia, M. Devetta, Y. Ovcharenko, S. Düsterer, K. Ueda, K. Bartschat, A. N. Grum-GrzhimailoA. V. Bozhevolnov, A. K. Kazansky, N. M. Kabachnik, M. Meyer

Research output: Contribution to journalArticlepeer-review

53 Citations (Scopus)


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.

Original languageEnglish
Article number013002
JournalPhysical review letters
Issue number1
Publication statusPublished - 2017 Jan 5

ASJC Scopus subject areas

  • Physics and Astronomy(all)


Dive into the research topics of 'Circular Dichroism in Multiphoton Ionization of Resonantly Excited He+ Ions'. Together they form a unique fingerprint.

Cite this