Title: Theory for real time analysis of laser-driven many-electron dynamics in atoms and molecules

Speaker: Haruhide Miyagi, IFA

Time and place: Thursday 21/11, 15:15, Phys. Aud.

Abstract:

Laser technology has continued to make remarkable progress and pronounce the need of reliable ab initio time-dependent (TD) many-electron theories for support to experiments on the real-time analysis and control of ultrafast electronic and nuclear dynamics of atoms and molecules by intense laser pulses. The TD configuration-interaction singles (TDCIS) method [1] is one of the simplest and the most well-known approaches in this research area. As another potential candidate, we developed the TD restricted-active-space self-consistent-field (TD-RASSCF) method [2]. Optimization of the orbitals as well as the expansion coefficients at each time step makes it possible to construct the wave function accurately while using only a relatively small number of electronic configurations. Importantly, it can be analytically shown that the TD-RASSCF method provides more precise descriptions of many-electron dynamics than the TDCIS method does. As a proof-of-principle application, one-dimensional model atoms are investigated: calculations of the ground-state wave functions, followed by computations of the high-order harmonic generation spectra.

[1] N. Rohringer, A. Gordon, and R. Santra, Phys. Rev. A 74, 043420 (2006).
[2] H. Miyagi and L. B. Madsen, Phys. Rev. A 87, 062511 (2013).

Coffee, tea and cake will be served at 15:05.

Annette Svendsen, Jacob Sherson and Aurelien Dantan