Hannover 2010 – scientific programme
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A: Fachverband Atomphysik
A 18: Precision Spectroscopy of Atoms and Ions II
A 18.3: Talk
Thursday, March 11, 2010, 11:00–11:15, F 107
Laser spectroscopy of highly charged argon at the Heidelberg electron beam ion trap — •Volkhard Mäckel, Renee Klawitter, Sven Bernitt, Günter Brenner, José Ramón Crespo López-Urrutia, and Joachim Ullrich — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg
We report on a laser fluorescence measurement of the forbidden visible transition in boron-like Ar13+ at the Heidelberg Electron Beam Ion Trap. The M1 1s22s22p 3P3/2 − 3P1/2 transition was resonantly excited using a tunable pulsed dye laser while simultaneously monitoring the fluorescence photons, yielding a wavelength of 441.2560(3) nm. Furthermore, by applying forced evaporative cooling on the trapped ions we were able to resolve the Zeeman splitting of the transition due to the magnetic field used for trapping the ions with a resolving power of λ/δλ=15000. It has to be noted that the present limitation is mainly due to the Doppler width of the trapped ions. Better cooling together with two-photon excitation should allow for further accuracy improvements.