2018/08/14 by Johan Hummert, Hummert, Johan, Markus Kubin +9
Chemistry · Physics and Astronomy · #Advanced Chemical Physics Studies #Atomic Physics (physics.atom-ph) #FOS: Physical sciences #Laser-Matter Interactions and Applications #Mass Spectrometry Techniques and Applications
paper · pdf · doi:10.48550/arxiv.1808.04639
openalex publication_date 2018/08/14 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We report on a combined experimental and theoretical study of XUV ionization of atomic argon in the presence of a near-infrared laser field. The resulting energy- and angle- resolved photoemission spectra have been described in the literature as interferences among different photoionization trajectories. Electron trajectories stemming from different optical laser cycles give rise to intercycle interference energy and result in new peaks known as sidebands. These sidebands are modulated by a coarse grained (gross) structure coming from the intracycle interference of the electron trajectories born during the same optical cycle. We calculate the photoelectron emission by solving the time-dependent Schrödinger equation ab initio and within the continuum-distorted wave strong field approximation. In order to compare with the experimental data we average the calculated energy-angle probability distributions over the experimental focal volume. This averaging procedure washes out the intracycle interference pattern, which we experimentally and theoretically (numerically) recover by subtracting two averaged distributions for slightly different near-infrared laser field intensities.