$Circular Dichroism in Multiphoton Ionization of Resonantly Excited He^{+} Ions$

Circular Dichroism in Multiphoton Ionization of Resonantly Excited He^{+} Ions

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 t...

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Veröffentlicht in:	Physical review letters 2017-01, Vol.118 (1), p.013002-013002, Article 013002
Hauptverfasser:	Ilchen, M, Douguet, N, Mazza, T, Rafipoor, A J, Callegari, C, Finetti, P, Plekan, O, Prince, K C, Demidovich, A, Grazioli, C, Avaldi, L, Bolognesi, P, Coreno, M, Di Fraia, M, Devetta, M, Ovcharenko, Y, Düsterer, S, Ueda, K, Bartschat, K, Grum-Grzhimailo, A N, Bozhevolnov, A V, Kazansky, A K, Kabachnik, N M, Meyer, M
Format:	Artikel
Sprache:	eng
Online-Zugang:	Volltext
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Zusammenfassung:	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.
ISSN:	0031-9007 1079-7114
DOI:	10.1103/PhysRevLett.118.013002