Two-color above-threshold and two-photon sequential double ionization beyond the dipole approximation

International Conference on Many Particle Spectroscopy of Atoms, Molecules, Clusters and Surfaces 2014

Grum-Grzhimailo, A.N.^1 ; Gryzlova, E.V.^1 ; Kuzmina, E.I.^1,2 ; Chetverkina, A.S.^1,2 ; Strakhova, S.I.^1

Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow

119991, Russia^1

Faculty of Physics, Lomonosov Moscow State University, Moscow

119991, Russia^2

关键词: Above-threshold ionization;    Dipole approximation;    Double ionization;    Non-dipole effects;    Photoelectron angular distributions;    Photoprocesses;    Two-photon double ionization;    X-ray free electron lasers;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/601/1/012012/pdf
DOI  :  10.1088/1742-6596/601/1/012012

来源: IOP

【 摘 要 】

Two nonlinear atomic photoprocesses are theoretically considered with the emphasis on the photoelectron angular distributions and their modifications due to violation of the dipole approximation: sequential two-photon double ionization and two-color above threshold ionization. These reactions are now accessible with X-ray free electron lasers. Both processes are exemplified by the ionization of krypton: from the 4p shell in the sequential two-photon double ionization and from the 2s shell in the two-color above-threshold ionization, which are compared to the Ar(3p) and Ne(1s) ionization, respectively. Noticeable nondipole effects are predicted.