Numerical simulation of the double-to-single ionization ratio for the helium atom in strong laser fields

K-REx Repository

Show simple item record Chen, Zhangjin Zheng, Yanyan Yang, Weifeng Song, Xiaohong Xu, Junliang DiMauro, L. F. Zatsarinny, Oleg Bartschat, Klaus Morishita, Toru Zhao, Song-Feng Lin, C. D. 2020-07-31T21:11:14Z 2020-07-31T21:11:14Z 2015-12-29
dc.description.abstract We present calculations on the ratio between double and single ionization of helium by a strong laser pulse at a wavelength of 780 nm using the quantitative rescattering (QRS) model. According to this model, the yield for the doubly charged ion He2+ can be obtained by multiplying the returning electron wave packet (RWP) with the total cross sections (TCSs) for electron impact ionization and electron impact excitation of He+ in the singlet spin channel. The singlet constraint was imposed since the interaction of the helium atom with the laser and the recollision processes both preserve the total spin of the system. An R-matrix (close-coupling) code is used to obtain accurate TCSs, while the RWPs, according to the QRS, are calculated by the strong-field approximation for high-energy photoelectrons. The laser field, which lowers the required energy for the electron to escape from the nucleus at the time of recollision, is also taken into account. The simulated results are in good agreement with the measured He2+/He+ ratio over a broad range of laser intensities. The result demonstrates that the QRS approach based on the rescattering model is fully capable of quantitatively interpreting nonsequential double ionization processes.
dc.rights ©2015 American Physical Society
dc.title Numerical simulation of the double-to-single ionization ratio for the helium atom in strong laser fields
dc.type Text 2015
dc.citation.doi 10.1103/PhysRevA.92.063427
dc.citation.issn 2469-9934
dc.citation.issue 6
dc.citation.jtitle Physical Review A
dc.citation.volume 92
dc.description.version Article: Version of Record

Files in this item

This item appears in the following Collection(s)

Show simple item record

©2015 American Physical Society Except where otherwise noted, the use of this item is bound by the following: ©2015 American Physical Society

Search K-REx

Advanced Search


My Account


Center for the

Advancement of Digital