Record Details

Title:
Clocking Femtosecond Collisional Dynamics via Resonant X-Ray Spectroscopy
Affiliation(s):
EuXFEL staff, Other
Author group:
Instrument HED
Topic:
Scientific area:
Abstract:
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 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 1 s → 2 p 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.
Imprint:
2018
Journal Information:
Physical Review Letters, 120 (5), Phys. Rev. Lett. (2018)
Related external records:
Language(s):
English


Export


 Record created 2018-03-05, last modified 2019-01-30

Fulltext:
Download fulltext
PDF

Rate this document:

Rate this document:
1
2
3
 
(Not yet reviewed)