著者
Shivaram Niranjan Timmers Henry Tong Xiao-Min Sandhu Arvinder
出版者
Elsevier B.V.
雑誌
Chemical physics (ISSN:03010104)
巻号頁・発行日
vol.414, pp.139-148, 2013-03
被引用文献数
7

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.

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