Prediction of the High-Harmonic Generation Spectra in the Helium Atom Using Quantum Chemistry Methods
September 27th, 2021 ALEKSANDER WOZNIAK Quantum Chemistry Laboratory,
University of Warsaw

The high-harmonic generation (HHG) has been intensively studied in the past, both experimentally and theoretically, mainly as a source for coherent ultraviolet and X-ray radiation. In recent experiments, HHG spectra for more and more complex systems are being reported, including organic and even biological compounds. Therefore, new methods for the theoretical description of this phenomenon are also required for a better understanding of its basis. The currently used grid-based approaches work well for single atoms or diatomic molecules, but are strongly limited by the number of electrons. In our studies, we explore the new way to predict the HHG spectra using methods known from quantum chemistry and based on the configuration interaction approach. We are currently focusing on the case of the helium atom, as a model many-electron system. We solve the time-dependent Schrödinger at various levels of theory, allowing us to determine the role of factors such as electronic correlation and non-sequential double ionization in the strong field electron Dynamics.

Zoom link to join in:
All interested may join this session.

Seminar, September 27, 2021, 10:15. Online (Zoom)

Hosted by Prof. Maciej Lewenstein