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 (2 s 2 p ) 1 o 1P 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:
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Physical Review A
- Pub Date:
- August 2018
- DOI:
- 10.1103/PhysRevA.98.023403
- arXiv:
- arXiv:1807.02183
- Bibcode:
- 2018PhRvA..98b3403D
- Keywords:
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- Physics - Atomic Physics
- E-Print:
- Phys. Rev. A 98, 023403 (2018)