High-Order Harmonic Generation in Helium: A Comparison Study
Atomic Physics
2024-03-06 v3 Computational Physics
Abstract
We report a detailed study of high-order harmonic generation (HHG) in helium. When comparing predictions from a single-active-electron model with those from all-electron simulations, such as ATTOMESA and R-matrix with time-dependence, which can include different numbers of states in the close-coupling expansion, it seems imperative to generate absolute numbers for the HHG spectrum in a well-defined framework. While qualitative agreement in the overall frequency dependence of the spectrum, including the cut-off frequency predicted by a semi-classical model, can be achieved by many models in arbitrary units, only absolute numbers can be used for benchmark comparisons between different approaches.
Cite
@article{arxiv.2311.03677,
title = {High-Order Harmonic Generation in Helium: A Comparison Study},
author = {A. T. Bondy and S. Saha and J. C. del Valle and A. Harth and N. Douguet and K. R. Hamilton and K. Bartschat},
journal= {arXiv preprint arXiv:2311.03677},
year = {2024}
}