Clocking Femtosecond Collisional Dynamics via Resonant X-Ray Spectroscopy

van den Berg, Q. Y.; Fernandez-Tello, E. V.; Burian, T.; Chalupský, J.; Chung, H. -K; Ciricosta, O.; Dakovski, G. L.; Hájková, V.; Hollebon, P.; Juha, L.; Krzywinski, J.; Lee, R. W.; Minitti, M. P.; Preston, T. R.; de la Varga, A. G.; Vozda, V.; Zastrau, U.; Wark, J. S.; Velarde, P.; Vinko, S. M.

doi:10.1103/physrevlett.120.055002

Title: Clocking Femtosecond Collisional Dynamics via Resonant X-Ray Spectroscopy

Journal Article · 31 January 2018 · Physical Review Letters

DOI: https://doi.org/10.1103/physrevlett.120.055002 · OSTI ID:1424721

van den Berg, Q. Y. ^[1]; Fernandez-Tello, E. V. ^[2]; Burian, T. ^[3]; Chalupský, J. ^[4]; Chung, H. -K ^[5]; Ciricosta, O. ^[1]; Dakovski, G. L. ^[6]; Hájková, V. ^[7]; Hollebon, P. ^[1]; Juha, L. ^[3]; Krzywinski, J. ^[6]; Lee, R. W. ^[8]; Minitti, M. P. ^[6]; Preston, T. R. ^[1]; de la Varga, A. G. ^[2]; Vozda, V. ^[4]; Zastrau, U. ^[9]; Wark, J. S. ^[1]; Velarde, P. ^[2]; Vinko, S. M. ^[1]

Univ. of Oxford (United Kingdom). Clarendon Lab., Dept. of Physics
Univ. Politecnica de Madrid, Madrid (Spain). Inst. de Fusion Nuclear
Academy of Sciences of the Czech Republic (ASCR), Prague (Czech Republic). Inst. of Physics; Inst. of Plasma Physics CAS, Prague (Czech Republic)
Academy of Sciences of the Czech Republic (ASCR), Prague (Czech Republic). Inst. of Physics
Intl Atomic Energy Agency (IAEA), Vienna (Austria). Atomic and Molecular Data Unit, Nuclear Data Section
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Academy of Sciences of the Czech Republic (ASCR), Prague (Czech Republic)
Univ. of California, Berkeley, CA (United States). Dept. of Physics
European X-ray Free-Electron Laser (XFEL), Hamburg (Germany)

Electron-ion collisional dynamics is of fundamental importance in determining plasma transport properties, nonequilibrium plasma evolution, and electron damage in diffraction imaging applications using bright x-ray free-electron lasers (FELs). Here in this paper, we describe the first experimental measurements of ultrafast electron impact collisional ionization dynamics using resonant core-hole spectroscopy in a solid-density magnesium plasma, created and diagnosed with the Linac Coherent Light Source x-ray FEL. By resonantly pumping the 1s → 2p transition in highly charged ions within an optically thin plasma, we have measured how off-resonance charge states are populated via collisional processes on femtosecond time scales. We present a collisional cross section model that matches our results and demonstrates how the cross sections are enhanced by dense-plasma effects including continuum lowering. Nonlocal thermodynamic equilibrium collisional radiative simulations show excellent agreement with the experimental results and provide new insight on collisional ionization and three-body-recombination processes in the dense-plasma regime.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1424721

Alternate ID(s):: OSTI ID: 1419118

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 5 Vol. 120; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Various damage mechanisms in carbon and silicon materials under femtosecond X-ray irradiation Medvedev, Nikita; Tkachenko, Viktor; Lipp, Vladimir Deutsches Elektronen-Synchrotron, DESY, Hamburg https://doi.org/10.3204/pubdb-2018-03176	text	January 2018
Validating Continuum Lowering Models via Multi-Wavelength Measurements of Integrated X-ray Emission Kasim, M. F.; Wark, J. S.; Vinko, S. M. arXiv https://doi.org/10.48550/arxiv.1802.01234	text	January 2018
Various damage mechanisms in carbon and silicon materials under femtosecond X-ray irradiation Medvedev, Nikita; Tkachenko, Viktor; Lipp, Vladimir 4open, Vol. 1 https://doi.org/10.1051/fopen/2018003	journal	January 2018
Transient space localization of electrons ejected from continuum atomic processes in hot dense plasma Liu, Pengfei; Gao, Cheng; Hou, Yong Communications Physics, Vol. 1, Issue 1 https://doi.org/10.1038/s42005-018-0093-5	journal	December 2018

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