Soft x-ray laser spectroscopy on trapped highly charged ions at FLASH.

Max-Planck-Institut für Kernphysik, D-69117 Heidelberg, Germany.
Physical Review Letters (Impact Factor: 7.73). 06/2007; 98(18):183001. DOI: 10.1103/PhysRevLett.98.183001
Source: PubMed

ABSTRACT In a proof-of-principle experiment, we demonstrate high-resolution resonant laser excitation in the soft x-ray region at 48.6 eV of the 2 (2)S(1/2) to 2 (2)P(1/2) transition of Li-like Fe23+ ions trapped in an electron beam ion trap by using ultrabrilliant light from Free Electron Laser in Hamburg (FLASH). High precision spectroscopic studies of highly charged ions at this and upcoming x-ray lasers with an expected accuracy gain up to a factor of a thousand, become possible with our technique, thus potentially yielding fundamental insights, e.g., into basic aspects of QED.