Application Of The Complex Kohn Variational Method To Attosecond Spectroscopy

Abstract

The complex Kohn variational method is extended to compute light-driven electronic transitions between continuum wave functions 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 several two-photon ionization pump-probe spectra, resonant with the (2s2p)P1o1 Feshbach resonance, with independent simulations based on the atomic B-spline close-coupling stock code, and find good agreement between the two approaches. This finite-pulse perturbative approach is a step towards the ab initio study of weak-field attosecond processes in polyelectronic molecules.

Publication Date

8-6-2018

Publication Title

Physical Review A

Volume

98

Issue

2

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1103/PhysRevA.98.023403

Socpus ID

85051211300 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85051211300

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