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Application of the Complex Kohn Variational Method to Attosecond Spectroscopy

Published

Author(s)

Barry I. Schneider, Nicholas Douguet, Luca Argenti

Abstract

The complex Kohn (CK) variational method is extended to compute light-driven electronic transitions between continuum wavefunctions in atomic and molecular systems. This development enables the study of multiphoton processes in the perturbative regime for arbitrary light polarization. As a proof of principle, we apply the method to compute the photoelectron spectrum arising from the pump-probe two-photon ionization of helium induced by a sequence of extreme ultraviolet and infrared-light pulses. We compare various two-photon ionization pump-probe spectra, resonant with the (2s2p)1P_0 Feshbach resonance, with independent simulations based on the B-spline close coupling STOCK code, and find good agreement between the two approaches. This new finite- pulse perturbative approach is a step towards ab initio study of weak-field attosecond processes in polyelectronic molecules
Citation
Physical Review A (Atomic, Molecular and Optical Physics)

Keywords

complex-kohn, photoionization, attosecond spectroscopy, strong field physics

Citation

Schneider, B. , Douguet, N. and Argenti, L. (2018), Application of the Complex Kohn Variational Method to Attosecond Spectroscopy, Physical Review A (Atomic, Molecular and Optical Physics), [online], https://doi.org/10.1103/PhysRevA.98.023403 (Accessed September 23, 2021)
Created August 6, 2018, Updated May 15, 2020