Multicolour above-threshold ionization of helium: quantum interference effects in angular distributions
|Title||Multicolour above-threshold ionization of helium: quantum interference effects in angular distributions|
|Publication Type||Journal Article|
|Year of Publication||2005|
|Guyetand, O, Gisselbrecht, M, Huetz, A, Agostini, P, Taieb, R, Veniard, V, Maquet, A, Antonucci, L, Boyko, O, Valentin, C, Douillet, D|
|Journal||JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS|
|Date Published||NOV 28|
Energy- and angle-resolved photoionization spectra of He irradiated by linearly polarized intense 810 run 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 degrees lobes which depend on the relative IR-XUV phase. Application to the characterization of attosecond pulses is suggested.