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X-Ray Sum Frequency Diffraction for Direct Imaging of Ultrafast Electron Dynamics

Journal Article · · Physical Review Letters
 [1];  [2];  [2];  [2]
  1. Univ. of California, Irvine, CA (United States). Dept. of Chemistry. Dept. of Physics and Astronomy; DOE/OSTI
  2. Univ. of California, Irvine, CA (United States). Dept. of Chemistry. Dept. of Physics and Astronomy
X-ray diffraction from molecules in the ground state produces an image of their charge density, and time-resolved x-ray diffraction can thus monitor the motion of the nuclei. However, the density change of excited valence electrons upon optical excitation can barely be monitored with regular diffraction techniques due to the overwhelming background contribution of the core electrons. We present a nonlinear x-ray technique made possible by novel free electron laser sources, which provides a spatial electron density image of valence electron excitations. The technique, sum frequency generation carried out with a visible pump and a broadband x-ray diffraction pulse, yields snapshots of the transition charge densities, which represent the electron density variations upon optical excitation. The technique is illustrated by ab initio simulations of transition charge density imaging for the optically induced electronic dynamics in a donor or acceptor substituted stilbene.
Research Organization:
Univ. of California, Irvine, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-04ER15571
OSTI ID:
1541326
Alternate ID(s):
OSTI ID: 1441256
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 24 Vol. 120; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (9)

Observation of strong nonlinear interactions in parametric down-conversion of X-rays into ultraviolet radiation journal December 2019
Atomic-scale imaging of laser-driven electron dynamics in solids using subcycle-resolved x-ray-optical wave mixing preprint January 2020
X-ray linear and non-linear spectroscopy of the ESCA molecule journal September 2019
Imaging electron-density fluctuations by multidimensional X-ray photon-coincidence diffraction journal December 2018
Imaging of transition charge densities involving carbon core excitations by all X-ray sum-frequency generation
  • Cho, Daeheum; Rouxel, Jérémy R.; Kowalewski, Markus
  • Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, Vol. 377, Issue 2145 https://doi.org/10.1098/rsta.2017.0470
journal April 2019
Violation of centrosymmetry in time-resolved coherent x-ray diffraction from rovibrational states of diatomic molecules journal March 2019
Theory of nonlinear interactions between x rays and optical radiation in crystals journal November 2019
Observation of strong nonlinear interactions in parametric down-conversion of x-rays into ultraviolet radiation text January 2019
Theory of nonlinear interactions between x rays and optical radiation in crystals text January 2019

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