Hollow ion emission driven by pulsed intense X-ray fieldsF. B. Rosmej1 and R. W. Lee2
1 Université de Provence et CNRS, UMR 6633, Centre de St-Jérôme, PIIM - F-13397 Marseille Cedex 20, France
2 L-399, Lawrence Livermore National Laboratory, University of California - P.O. Box 808, Livermore, CA 94551, USA
received 9 September 2006; accepted in final form 16 November 2006; published January 2007
published online 10 January 2007
Transient hollow ion atomic radiation field kinetics is developed which shows that short pulse intense narrow-band X-ray sources enable the rise of hollow ion population densities in dense plasmas more than 10 orders of magnitude higher than without pump. The subsequent hollow ion X-ray emission, which will escape even extremely high-density plasmas without detrimental absorption, will open up a new field of research and allow novel studies of atomic systems in intense Coulomb fields. Simulations including relaxation effects show that for parameters of currently established free-electron X-ray lasers atomic chain reactions can be initiated which drive efficient hollow ion X-ray emission.
41.60.Cr - Free-electron lasers .
52.38.Ph - X-ray, -ray and particle generation .
32.80.Fb - Photoionization of atoms and ions .
© Europhysics Letters Association 2007