NOTICE: Due to a lapse in annual appropriations, most of this website is not being updated. Learn more.

Form submissions will still be accepted but will not receive responses at this time. Sections of this site for programs using non-appropriated funds (such as NVLAP) or those that are excepted from the shutdown (such as CHIPS and NVD) will continue to be updated.

U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

PUBLICATIONS

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)
Pub Type
Journals

Download Paper

DOI Link

Keywords

complex-kohn, photoionization, attosecond spectroscopy, strong field physics
Electron 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 October 13, 2025)

Issues

If you have any questions about this publication or are having problems accessing it, please contact [email protected].

Created August 6, 2018, Updated May 15, 2020
Was this page helpful?