Heidelberg 2015 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 35: Poster: Precision spectroscopy of atoms and ions (with Q)
A 35.10: Poster
Donnerstag, 26. März 2015, 17:00–19:00, C/Foyer
High-resolution spectroscopy with multi-photon transitions in Highly Charged Ions — •Andrii Borodin, José R. Crespo López-Urrutia, and Thomas Pfeifer — Max Planck Institute for Nuclear Physics, Heidelberg
Highly charged ions (HCI), being atomic systems with tightly bound electrons, allow performing accurate tests of quantum electrodynamics, and determination of high-precision values of fundamental constants. Nowadays, HCI are routinely produced using electron beam ion traps. HCI are abundant in hot plasmas in stars, and thus are also of interest for astrophysics. Their advantages for studies of time variations of fundamental constants have been recently emphasized. So far, most observations in HCI are made with ions at temperatures of more than 102 eV. Recent progress in trapping HCI in a cryogenic linear quadrupole trap [Schwarz et al, Rev. Sci. Inst. 83, pp. 1-10 (2012)], and sympathetic cooling with Be+ ions, opens up the possibility for high-precision laser spectroscopy. A very large number of transitions 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 multi-photon transitions, induced by femtosecond laser pulses and amplified by an enhancement cavity. An experimental scheme for realizing this approach will be presented.