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Poster Session

Poster Session II

4:00 pm – 6:00 pm, Wednesday June 18 Session H00 Oregon Convention Center, Exhibit Hall E
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Above Threshold Ionization in Atoms Induced by Intense X-ray Radiation Fields

Poster 33
Presenter: Spencer Roman Walker (Ohio State University)
Author: Alexandra Landsman (Ohio State University)



This study explores Above Threshold Ionization (ATI) in atoms under intense X-ray radiation, where photon energy surpasses the ionization potential of valence electrons. We discuss conditions akin to those in current or future free-electron laser facilities. Our analytical model (derived in Ref. [1]) examines how field-free ionization potential, ponderomotive energy, and photon energy influence the transition to strong field ionization, using Keldysh and Reiss parameters. We demonstrate that both parameters are essential to capture strong-field behavior due to bound and continuum state properties. At higher X-ray intensities, ionization rates deviate from linear intensity scaling, indicating channel closure and higher-order photon absorption processes.

Funding acknowledgement

We acknowledge U.S. Department of Energy, Office of Basic Energy Sciences, Atomic, Molecular, and Optical Sciences Program, Award ID DE-SC0022093.

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