Ab initio numerical methods for attosecond molecular spectroscopy

ORAL

Abstract

We present our recent advances towards the development of two original numerical methods to describe the interaction between ultra-short laser pulses and correlated molecular systems. The first method, CK-LOPT [1], uses the Complex Kohn (CK) variational approach to compute multi-photon amplitudes at the lowest-order level of perturbation theory (LOPT). It can describe molecular photoionization time delay and transient absorption spectra in relatively weak fields, when only few-photon exchanges are involved. The second method, FEDVR-TDSE, uses an hybrid Gaussian and FEDVR basis set to solve the time-dependent Schr\"{o}dinger equation (TDSE), within the same close-coupling framework employed in the CK approach, and can be applied to nonpertubative regimes as well. [1] N. Douguet, B. I. Schneider, and L. Argenti, Phys. Rev. A {\bf 98} 023403 (2018),

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Authors

  • Nicolas Douguet

    University of Central Florida, Department of Physics, University of Central Florida

  • HEMAN GHARIBNEJAD

    National Institute of Standards and Technology

  • Barry Schneider

    National Institute of Standards and Technology

  • Luca Argenti

    CREOL and Phys. Dept., University of Central Florida, Dep. Physics and CREOL at the University of Central Florida, Department of Physics and CREOL, University of Central Florida, Dept of Physics and CREOL at the University of Central Florida, University of Central Florida