Dynamic Stark effect on XUV-laser-generated photoelectron spectra: Numerical experiment on atomic hydrogen

We present the results of our numerical simulation on the photoelectron spectra of hydrogen atoms ionized by the single-photon process of intense XUV laser pulses. The dynamic interference structure in the photoelectron spectra is investigated with respect to the dynamic Stark effect, XUV laser parameters, and properties of the ionization continuum states. The research outcome is that plane waves can be readily deployed to study photoelectron spectroscopy, which is crucial to the wave-function ansatz for generic systems of atoms and molecules. The dynamic Stark effect is prominently demonstrated above certain carrier frequencies of the XUV laser pulse, which mandates a photon energy threshold for the dynamic Stark effect to be discerned in the photoelectron spectra. A one-dimensional model for the hydrogen atom is feasible, which is of fundamental significance in modeling atoms and molecules with reduced dimensionality models. We also point out that detailed characterization of the interference fringes in the photoelectron spectra will facilitate more quantitative investigations of the Stark effect contained in the photoelectron spectra created by single XUV photons. DOI: 10.1103/PhysRevA.87.043405