Modeling the sequential dissociative double ionization of O2 by ultrashort intense infrared laser pulses

C. H. Yuen, P. Modak, Yan Song, Song-Feng Zhao, and C. D. Lin
Phys. Rev. A 107, 013112 – Published 24 January 2023

Abstract

A density matrix approach for sequential double ionization (DM-SDI) of molecules has been developed recently and was applied to the N2 molecule [Yuen and Lin, Phys. Rev. A 106, 023120 (2022)]. In this article, we extended the DM-SDI model to O2, which is a more complicated system to model than N2, due to its electronic structures and spin-orbit and laser couplings in the manifold of doubly charged states. We obtained a good agreement on the kinetic energy release spectrum of O++O+ from previous experiments. Thanks to the low computational cost of the model, we explored the mechanism behind the ionization and dissociation dynamics as well as the effects of lasers on the spectrum. This work will pave the way to model sequential dissociative double ionization of larger molecules and to probe molecular dynamics by measuring kinetic energy release spectra from this process.

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  • Received 19 October 2022
  • Accepted 11 January 2023

DOI:https://doi.org/10.1103/PhysRevA.107.013112

©2023 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

C. H. Yuen1,*, P. Modak1, Yan Song2, Song-Feng Zhao2, and C. D. Lin1,†

  • 1J. R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, Kansas 66506, USA
  • 2Key Laboratory of Atomic and Molecular Physics and Functional Materials of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China

  • *iyuen@phys.ksu.edu
  • cdlin@phys.ksu.edu

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Vol. 107, Iss. 1 — January 2023

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