Hannover 2016 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 30: Precision spectroscopy of atoms and ions (with Q)
A 30.22: Poster
Mittwoch, 2. März 2016, 16:30–19:00, Empore Lichthof
High resolution spectroscopy in HCI using High-order Harmonic Generation — •Janko Nauta1, Andrii Borodin1, Peter Micke1,2, Lisa Schmöger1,2, Maria Schwarz1,2, Julian Stark1, José R. Crespo López-Urrutia1, and Thomas Pfeifer1 — 1Max-Planck-Institut für Kernphysik — 2Physikalisch-Technische Bundesanstalt, Braunschweig
Highly charged ions (HCI) are atomic systems with a few tightly bound electrons. HCI exhibit much more pronounced quantum-electrodynamics effects than neutrals and singly charged particles, thus allowing accurate tests of fundamental theory to be performed, and high precision determination of values of fundamental constants. Most observations in HCI are made with ions at temperatures of more than 102 eV using electron-beam ion traps. Recent progress in trapping HCI in a cryogenic linear quadrupole trap, and sympathetic cooling with Be+ ions [M. Schwarz et al, Rev. Sci. Inst. 83, pp. 1-10 (2012), L. Schmöger et al, Science 347, pp. 1233-1236 (2015)], opens up the possibility for high-precision laser spectroscopy. Many transitions in HCI have energies of few ten eV. So far, excitation of these transitions required the use of free-electron lasers. The aim of this project is to perform high-resolution spectroscopy of extreme ultraviolet transitions by high-order harmonics generated by femtosecond laser pulses, which are amplified by an enhancement cavity. An experimental scheme for realizing this approach will be presented.