@article{oai:tsukuba.repo.nii.ac.jp:00028706,
 author = {仝, 暁民 and Shivaram, Niranjan and Timmers, Henry and Tong, Xiao-Min and Sandhu, Arvinder},
 journal = {Chemical physics},
 month = {Mar},
 note = {We present experimental results and a theoretical framework for understanding the ionization dynamics in atoms exposed to XUV attosecond pulse trains and strong multi-cycle infrared (IR) fields. We invoke the Floquet formalism to model dressed atomic states as a manifold of Fourier components spaced by the laser frequency. In XUV-IR pump–probe measurements, we observe that the ionization yield oscillates due to quantum interference between photo-excitation paths to a Floquet state. We show that the intensity-dependent shifts of atomic structure modify the ionization channels and the associated interference phase. We extract this phase variation and compare it with simulations. These results provide a comprehensive description of the two-color ionization process and enable new schemes for control of attosecond ionization and fragmentation dynamics.},
 pages = {139--148},
 title = {Photoionization dynamics in the presence of attosecond pulse trains and strong fields},
 volume = {414},
 year = {2013}
}