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Title: Time-dependent QED approach to x-ray nonlinear Compton scattering

Abstract

Motivated by a recent experiment, we theoretically investigate the process of x-ray nonlinear Compton scattering (XNLC). Our approach is based on the time-dependent Schrödinger equation for an atomic system subject to an intense x-ray pulse, and explicitly accounts for the spontaneous scattering into a quantized photonic mode. We employ our framework to study multiple nonlinear scattering scenarios. Initially, we consider soft x rays at 500eV photon energy to scatter nonlinearly off a helium target. For this, we find that XNLC is dominated by certain third-order processes rather than the naïvely expected mechanisms pertaining to the lowest order of perturbation theory. Subsequently, we apply our model to XNLC in helium at 4.0keV photon energy and beryllium at 9.7keV. Contrary to the conclusions drawn from the experimental observations, our results suggest a good agreement of the XNLC spectrum with simple, free-electron model predictions. Furthermore, our studies reveal striking qualitative similarities of linear and nonlinear Compton scattering cross sections in this regime.

Authors:
 [1];  [2];  [1]
  1. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany); Univ. of Hamburg, Hamburg (Germany); The Hamburg Centre for Ultrafast Imaging, Hamburg (Germany)
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1504575
Alternate Identifier(s):
OSTI ID: 1546330
Grant/Contract Number:  
AC02-76SF00515; 194651731
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review A
Additional Journal Information:
Journal Volume: 99; Journal Issue: 2; Journal ID: ISSN 2469-9926
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS

Citation Formats

Krebs, Dietrich, Reis, David A., and Santra, Robin. Time-dependent QED approach to x-ray nonlinear Compton scattering. United States: N. p., 2019. Web. doi:10.1103/physreva.99.022120.
Krebs, Dietrich, Reis, David A., & Santra, Robin. Time-dependent QED approach to x-ray nonlinear Compton scattering. United States. doi:10.1103/physreva.99.022120.
Krebs, Dietrich, Reis, David A., and Santra, Robin. Wed . "Time-dependent QED approach to x-ray nonlinear Compton scattering". United States. doi:10.1103/physreva.99.022120. https://www.osti.gov/servlets/purl/1504575.
@article{osti_1504575,
title = {Time-dependent QED approach to x-ray nonlinear Compton scattering},
author = {Krebs, Dietrich and Reis, David A. and Santra, Robin},
abstractNote = {Motivated by a recent experiment, we theoretically investigate the process of x-ray nonlinear Compton scattering (XNLC). Our approach is based on the time-dependent Schrödinger equation for an atomic system subject to an intense x-ray pulse, and explicitly accounts for the spontaneous scattering into a quantized photonic mode. We employ our framework to study multiple nonlinear scattering scenarios. Initially, we consider soft x rays at 500eV photon energy to scatter nonlinearly off a helium target. For this, we find that XNLC is dominated by certain third-order processes rather than the naïvely expected mechanisms pertaining to the lowest order of perturbation theory. Subsequently, we apply our model to XNLC in helium at 4.0keV photon energy and beryllium at 9.7keV. Contrary to the conclusions drawn from the experimental observations, our results suggest a good agreement of the XNLC spectrum with simple, free-electron model predictions. Furthermore, our studies reveal striking qualitative similarities of linear and nonlinear Compton scattering cross sections in this regime.},
doi = {10.1103/physreva.99.022120},
journal = {Physical Review A},
number = 2,
volume = 99,
place = {United States},
year = {2019},
month = {2}
}

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    Works referencing / citing this record:

    Time-dependent QED approach to x-ray nonlinear Compton scattering
    text, January 2019

    • Krebs, Dietrich; Reis, David A.; Santra, Robin
    • Deutsches Elektronen-Synchrotron, DESY, Hamburg
    • DOI: 10.3204/pubdb-2019-01191