Competition between dynamic resonance and internal conversion in strong-field molecular ionization with chirped ultrafast laser pulses

Author(s)
Brian Kaufman, Tamas Rozgonyi, Philipp Marquetand, Thomas Weinacht
Abstract

We show how the time-varying phase or frequency of a chirped strong-field ultrafast laser pulse can be used to control the ionization yield to different ionic states in a polyatomic molecule. The control is based upon a competition between multiphoton resonance and internal conversion. The multiphoton resonance is facilitated by dynamic Stark shifts, while the internal conversion (coupling between electronic states) is due to violation of the Born-Oppenheimer approximation. Our measurements are compared with and interpreted in terms of calculations of the strong-field ionization dynamics, which include multiphoton resonance, dynamic Stark shifts, as well as vibrational dynamics and internal conversion during the ionization process. The measurements and calculations illustrate how the light matter coupling can compete with the coupled motions of electrons and nuclei in strong-field laser-molecule interactions.

Organisation(s)
Department of Theoretical Chemistry, Research Network Data Science
External organisation(s)
State University of New York, Stony Brook, Hungarian Academy of Sciences
Journal
Physical Review A
Volume
103
No. of pages
7
ISSN
2469-9926
DOI
https://doi.org/10.1103/PhysRevA.103.023108
Publication date
02-2021
Peer reviewed
Yes
Austrian Fields of Science 2012
104017 Physical chemistry, 103006 Chemical physics
Portal url
https://ucris.univie.ac.at/portal/en/publications/competition-between-dynamic-resonance-and-internal-conversion-in-strongfield-molecular-ionization-with-chirped-ultrafast-laser-pulses(c0820843-1c1b-4b81-9b1c-63d42266170d).html