Dresden 2011 – scientific programme

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A: Fachverband Atomphysik

A 26: Poster III

A 26.52: Poster

Thursday, March 17, 2011, 16:00–18:30, P2

Laser spectroscopy of evaporatively cooled highly charged ions at the Heidelberg Electron Beam Ion Trap — •Volkhard Mäckel, Renee Klavitter, Günter Brenner, José Ramón Crespo López-Urrutia, and Joachim Ullrich — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg

We report on two level laser fluorescence measurement of the forbidden 1s²2s²2p ²P_3/2-²P_1/2 M1 transition in boron-like Ar¹³⁺ at the Heidelberg Electron Beam Ion Trap. The transition was resonantly excited using a tunable pulsed dye laser while simultaneously monitoring the fluorescence photons, yielding a wavelength of 441.25575(17) nm. Forced evaporative cooling on the trapped ions yielded a resolving power of λ/δλ=15000, thus being able to resolve the Zeeman splitting of the transition due to the magnetic field present in the trap. This approach in combination with further cooling and two-photon excitation techniques can yield for far more accurate transition energies in highly charged ions than currently possible, pointing toward new precision optical frequency standards based upon highly charged ions.