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Title: Large-scale atomistic calculations of clusters in intense x-ray pulses

Journal Article · · Journal of Physics. B, Atomic, Molecular and Optical Physics
 [1];  [1]
  1. Argonne National Lab. (ANL), Argonne, IL (United States)

Here, we present the methodology of our recently developed Monte-Carlo/ Molecular-Dynamics method for studying the fundamental ultrafast dynamics induced by high-fluence, high-intensity x-ray free electron laser (XFEL) pulses in clusters. The quantum nature of the initiating ionization process is accounted for by a Monte Carlo method to calculate probabilities of electronic transitions, including photo absorption, inner-shell relaxation, photon scattering, electron collision and recombination dynamics, and thus track the transient electronic configurations explicitly. The freed electrons and ions are followed by classical particle trajectories using a molecular dynamics algorithm. These calculations reveal the surprising role of electron-ion recombination processes that lead to the development of nonuniform spatial charge density profiles in x-ray excited clusters over femtosecond timescales. In the high-intensity limit, it is important to include the recombination dynamics in the calculated scattering response even for a 2- fs pulse. We also demonstrate that our numerical codes and algorithms can make e!cient use of the computational power of massively parallel supercomputers to investigate the intense-field dynamics in systems with increasing complexity and size at the ultrafast timescale and in non-linear x-ray interaction regimes. In particular, picosecond trajectories of XFEL clusters with attosecond time resolution containing millions of particles can be e!ciently computed on upwards of 262,144 processes.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1374543
Journal Information:
Journal of Physics. B, Atomic, Molecular and Optical Physics, Vol. 50, Issue 10; ISSN 0953-4075
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 15 works
Citation information provided by
Web of Science

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Cited By (8)

The role of transient resonances for ultra-fast imaging of single sucrose nanoclusters journal January 2020
Imaging plasma formation in isolated nanoparticles with ultrafast resonant scattering journal May 2020
Theoretical evidence for the sensitivity of charge-rearrangement-enhanced x-ray ionization to molecular size journal July 2019
Amplified spontaneous emission in the extreme ultraviolet by expanding xenon clusters journal June 2020
Theoretical evidence for the sensitivity of charge-rearrangement-enhanced x-ray ionization to molecular size text January 2019
Imaging plasma formation in isolated nanoparticles with ultrafast resonant scattering text January 2020
Amplified spontaneous emission in the extreme ultraviolet by expanding xenon clusters text January 2020
Theoretical evidence for the sensitivity of charge-rearrangement-enhanced x-ray ionization to molecular size text January 2019

Figures / Tables (7)


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