AUTHOR=Kutscher Eric , Artemyev Anton N. , Demekhin Philipp V. 

TITLE=Electron Dynamics and Correlations During High-Order Harmonic Generation in Be

JOURNAL=Frontiers in Chemistry

VOLUME=10

YEAR=2022

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2022.809137

DOI=10.3389/fchem.2022.809137

ISSN=2296-2646

ABSTRACT=<p>We investigate theoretically the high-order harmonic generation in beryllium atom irradiated by a short 1850 nm linearly polarized laser pulse in the intermediate strong-field ionization regime with the Keldysh parameter of 0.85. To this end, the respective time-dependent Schrödinger equation is solved by the time-dependent restricted-active-space configuration-interaction (TD-RASCI) method. By systematically increasing the active space of included configurations, we demonstrate an individual effect of different physical processes evoked by the pulse, which, all together, significantly enrich and extend the computed high-order harmonic generation spectrum.</p>