Observing Superexcited State Dynamics in Atomic and Molecular Systems by Attosecond Transient Absorption

ORAL

Abstract

The electron dynamics of superexcited atomic and molecular states are studied experimentally and theoretically. For atomic systems, such as $3s3p^6 5p$ autoionizing state in argon, delay-dependent optical density (OD) only shows positive changes. However, molecular system such as Oxygen shows positive OD in the case of $ns\sigma_g$ and $ns\pi_g$ autoionizing states of oxygen and negative OD for $nd\sigma_g$ states. The negative OD change corresponds to the reduced absorption comparing to the static continuum background. We investigated this electron symmetry dependent effect in depth experimentally by attosecond transient absorption spectroscopy, and theoretically by multiconfiguration time-dependent Hartree-Fock (MCTDHF) method.

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Authors

  • Chen-Ting Liao

    • College of Optical Sciences and Department of Physics, University of Arizona

  • Xuan Li

    • Ultrafast X-ray Science Laboratory, Chemical Sciences Division, Lawrence Berkeley National Laboratory

  • Daniel Haxton

    • Ultrafast X-ray Science Laboratory, Chemical Sciences Division, Lawrence Berkeley National Laboratory

  • Robert Lucchese

    • Chemistry Department, Texas A&M University

  • C. W. McCurdy

    • Lawrence Berkeley National Laboratory and University of California, Davis, California, USA
    • Department of Chemistry, University of California, Davis
    • University of California, Davis
    • UC Davis and Lawrence Berkeley National Laboratory

  • Arvinder Sandhu

    • College of Optical Sciences and Department of Physics, University of Arizona