We consider few-photon ionization of atomic lithium by linearly polarized femtosecond laser pulses and demonstrate that asymmetries of the electron angular distribution can occur for initially polarized (2p, m=+1) target atoms. The dependence of the photoelectron emission angle relative to the electric field direction is investigated at different laser intensities and wavelengths. The experimental spectra show excellent agreement with numerical solutions of the time-dependent Schrödinger equation. In the perturbative picture, the angular shift is traced back to interferences between partial waves with mean magnetic quantum number (m)≠0. This observation allows us to obtain quantum mechanical information on the final electronic state.
B. P. Acharya and M. Dodson and S. Dubey and K. L. Romans and A. H. De Silva and K. Foster and O. Russ and K. Bartschat and N. Douguet and D. Fischer, "Magnetic Dichroism in Few-Photon Ionization of Polarized Atoms," Physical Review A, vol. 104, no. 5, article no. 53103, American Physical Society (APS), Nov 2021.
The definitive version is available at https://doi.org/10.1103/PhysRevA.104.053103
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05 Nov 2021