Bulletin of the American Physical Society
52nd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 66, Number 6
Monday–Friday, May 31–June 4 2021; Virtual; Time Zone: Central Daylight Time, USA
Session M02: Attosecond pulses and attosecond dynamics
2:00 PM–4:00 PM,
Wednesday, June 2, 2021
Chair: Guillaume Laurent, Auburn University
Abstract: M02.00010 : Molecular RABITT time delays studied using the time-independent multi-photon R-matrix method*
3:48 PM–4:00 PM
Live
Presenter:
Jakub Benda
(Institute of Theoretical Physics, Charles University)
Authors:
Jakub Benda
(Institute of Theoretical Physics, Charles University)
Zdenek Masin
(Institute of Theoretical Physics, Charles University)
Jimena D Gorfinkiel
(School of Physical Sciences, Open University)
Collaboration:
UK-AMOR
In this contribution we apply the new method to calculation of RABITT time delays in molecules. We demonstrate that the access to accurate two-photon ionization amplitudes enables us to obtain the full RABITT time delays, directly comparable with time-dependent methods and with experiment. This is in contrast to methods used so far, which calculate the time delays measured by the two-photon experiment as a sum of the one-photon molecular delay and a so called measurement delay caused by absorption of the probe photon, which is calculated from the asymptotic theory. We illustrate that the accuracy of this asymptotic correction, compared to our two-photon method, decreases dramatically at low energies. Finally, we discuss the origin of several features in the energy dependence of the photoionization time delay and the effect of molecular orientation averaging on them.
*Both authors acknowledge support of the Czech Science Foundation as the project GA CR 20-15548Y and support of the Charles University as the project PRIMUS 20/SCI/003.
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