Coherence from multiorbital tunneling ionization of molecules

Yuen, Chi-Hong; Lin, Chii-Dong

doi:10.1103/physreva.108.023123

Title: Coherence from multiorbital tunneling ionization of molecules

Journal Article · 28 August 2023 · Physical Review A

DOI: https://doi.org/10.1103/physreva.108.023123 · OSTI ID:1996792

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Kansas State University, Manhattan, KS (United States)

We present a simple and general coherence model for multiorbital tunnel ionization of molecules, which we incorporate into our previously developed density-matrix approach for sequential double ionization. Here, the influence of this coherence is investigated through simulations of single ionization and sequential double ionization of N₂ and O₂ using few-cycle near-infrared laser pulses. In the case of single ionization, our results reveal the crucial role played by this coherence in generating population inversion in N₂⁺, suggesting a potential mechanism for air lasing. Regarding sequential double ionization, we observe only minor changes in the kinetic energy release spectra when the coherence is included, while noticeable differences in the angle-dependent dication yield for both N₂ and O₂ are found. Based on these findings, we recommend the inclusion of multiorbital tunnel ionization coherence in models for single ionization of general molecules, while suggesting that it can be safely neglected in the case of sequential double ionization.

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Research Organization:: Kansas State Univ., Manhattan, KS (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB)

Grant/Contract Number:: FG02-86ER13491

OSTI ID:: 1996792

Journal Information:: Physical Review A, Vol. 108, Issue 2; ISSN 2469-9926

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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