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Descripción
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| Electron-ion collisional dynamics is of fundamental importance in determining plasma transport properties, non-equilibrium plasma evolution and electron damage in di raction imaging applications using bright x-ray free-electron lasers (FELs). Here we describe the ?rst experimental measurements of ultra-fast 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 o -resonance charge states are populated via collisional processes on femtosecond times scales. We present a collisional cross section model that matches our results and demonstrates how the cross sections are enhanced by dense-plasma e ects including continuum lowering. Non-LTE (local 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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Internacional
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Si |
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JCR del ISI
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Si |
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Título de la revista
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Physical Review Letters |
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ISSN
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0031-9007 |
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Factor de impacto JCR
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8,839 |
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Información de impacto
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Volumen
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DOI
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10.1103/PhysRevLett.120.055002 |
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Número de revista
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120 |
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Desde la página
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