skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Numerical Detector Theory for the Longitudinal Momentum Distribution of the Electron in Strong Field Ionization

Authors:
; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1359988
Grant/Contract Number:
FG02-05ER15713; TZ2017005
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 118; Journal Issue: 21; Related Information: CHORUS Timestamp: 2017-05-26 22:12:13; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English

Citation Formats

Tian, Justin, Wang, Xu, and Eberly, J. H. Numerical Detector Theory for the Longitudinal Momentum Distribution of the Electron in Strong Field Ionization. United States: N. p., 2017. Web. doi:10.1103/PhysRevLett.118.213201.
Tian, Justin, Wang, Xu, & Eberly, J. H. Numerical Detector Theory for the Longitudinal Momentum Distribution of the Electron in Strong Field Ionization. United States. doi:10.1103/PhysRevLett.118.213201.
Tian, Justin, Wang, Xu, and Eberly, J. H. 2017. "Numerical Detector Theory for the Longitudinal Momentum Distribution of the Electron in Strong Field Ionization". United States. doi:10.1103/PhysRevLett.118.213201.
@article{osti_1359988,
title = {Numerical Detector Theory for the Longitudinal Momentum Distribution of the Electron in Strong Field Ionization},
author = {Tian, Justin and Wang, Xu and Eberly, J. H.},
abstractNote = {},
doi = {10.1103/PhysRevLett.118.213201},
journal = {Physical Review Letters},
number = 21,
volume = 118,
place = {United States},
year = 2017,
month = 5
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on May 26, 2018
Publisher's Accepted Manuscript

Save / Share:
  • We study the correlated two-electron momentum spectra of the nonsequential double ionization (NSDI) of an atom in an intense laser field based on the recently developed quantitative rescattering (QRS) theory. According to the rescattering model, an electron that was released earlier in the laser pulse may return to collide again with the target ion. NSDI can occur directly if this electron knocks out another electron in a process similar to the (e,2e) process or indirectly by first exciting the target ion to an excited state which is later ionized by the laser field. Using QRS, we obtain the returning electronmore » wave packet. By multiplying this wave packet with standard field-free (e,2e) differential cross sections, or with inelastic electron-impact excitation cross sections and the subsequent tunneling ionization, we obtain the correlated two-electron momentum spectra. The calculated spectra agree mostly with the experimental data. However, experimental data show additional features that cannot be accounted for by these two mechanisms only, and other mechanisms for NSDI are suggested. The contributions of these mechanisms to the longitudinal ion momentum distributions are also analyzed. The present quantum mechanical QRS calculation verifies the validity of rescattering model for the NSDI processes at the most fundamental and detailed level.« less
  • The longitudinal recoil-ion momentum distributions of single ionization in collisions between fast heavy ions and atoms are analyzed by exploring the three-body kinematics and its relation to dynamic processes. It is found that there is a kinematic threshold for the longitudinal recoil-ion momentum distributions that can be ascribed to electron capture to the continuum (ECC). The finite cross section at threshold provides unambiguous evidence of the divergence of the ECC peak when the electron velocity is equal to the projectile velocity. Other aspects associated with the ionization process, such as soft-electron emission and binary-encounter collision, are also studied. Theoretical longitudinalmore » recoil-ion momentum distributions are also compared to existing experiments.« less
  • The connection between the ejected electron doubly differential cross section (DDCS) and the longitudinal recoil-ion momentum distribution is presented. The relation between the two allows the authors to obtain a precise measurement and/or calculation of the doubly differential cross section with respect to longitudinal recoil-ion momentum and ejected electron angle d{sup 2}{sigma}/(dp{sub R{parallel}}d{Omega}{sub e)} based on the corresponding electron DDCS. Distinct features characterizing fast ion-atom ionization processes are identified in both spectra.
  • We provide the first uniform explanation basis for the laser intensity dependence of the momentum distributions that have been reported in atomic nonsequential double-ionization experiments. Our theoretical work covers laser irradiation at 780 nm and intensities in the range I=(1-6.5)x10{sup 14} W/cm{sup 2}, which are relevant to experiments. We use a completely classical method introduced previously [Phay J. Ho, R. Panfili, S. L. Haan, and J. H. Eberly, Phys. Rev. Lett. 94, 093002 (2005)]. Our calculated results suggest that just two distinct categories of electron trajectories are relevant.
  • We report on a kinematically complete experiment on nonsequential double ionization of He by 25 fs 800 nm laser pulses at 1.5 PW/cm{sup 2}. The suppression of the recollision-induced excitation at this high intensity allows us to address in a clean way direct (e,2e) ionization by the recolliding electron. In contrast with earlier experimental results, but in agreement with various theoretical predictions, the two-electron momentum distributions along the laser polarization axis exhibit a pronounced V-shaped structure, which can be explained by the role of Coulomb repulsion and typical (e,2e) kinematics.