Multicolour above-threshold ionization of helium: quantum interference effects in angular distributions
- Guyetand, O.
- Gisselbrecht, M.
- Huetz, A.
- Agostini, P.
- Taïeb, R.
- Véniard, V.
- Maquet, A.
- Antonucci, L.
- Boyko-Kazymyrenko, Olga
- Valentin, C.
- Douillet, D.
DOIAbstract
International audienceEnergy- and angle-resolved photoionization spectra of He irradiated by linearly polarized intense 810 nm laser radiation and several of its XUV odd harmonics are investigated. The angular distribution of the odd-order peaks, produced by single-photon ionization by one harmonic, is, surprisingly, broadened by the IR field. The even-order ones, due to two-colour, two-photon ionization, show at 90° lobes which depend on the relative IR–XUV phase. Application to the characterization of attosecond pulses is suggested
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