Stuttgart 2012 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

A: Fachverband Atomphysik

A 30: Precision spectroscopy of atoms and ions II

A 30.1: Hauptvortrag

Donnerstag, 15. März 2012, 10:30–11:00, V47.03

X-ray laser spectroscopy at the free-electron laser LCLS — •José R. Crespo López-Urrutia — Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany

X-ray laser spectroscopy (XRLS) has been demonstrated by using an electron beam ion trap (EBIT) at the recently commissioned free-electron laser Linac Coherent Light Source (LCLS) at SLAC. Many of the limitations in accuracy and selectivity which had hitherto hampered spectroscopic investigations of highly charged ions (HCIs) are overcome by the introduction of XRLS. The present results on Fe^15+,16+ strongly challenge state-of-the-art calculations widely used for astrophysical plasma diagnostics.

The novel method has also been applied to high-energy synchrotron radiation sources (BESSY II, PETRA III) for studies of the photoionization and excitation of HCIs in charge states as high as Fe²⁴⁺ and at photon energies in the 6 keV range.

Future improvements of these X-ray sources, e. g. through radiation seeding, will help to develop this field further. New possibilities appear for the study and diagnostics of astrophysical and terrestrial plasmas as well as for X-ray metrology. Moreover, the new data stringently benchmark and guide the development of relativistic atomic structure theory.