Berlin 2001 – scientific programme

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A: Atomphysik

A 17: Posters Friday (Spectroscopy)

A 17.34: Poster

Friday, April 6, 2001, 12:30–15:00, AT3

Experimental determination of the ground state g_J-factor of Ca⁺ — •Giovanni Tommaseo¹, Tobias Pfeil¹, Gita Revalde², and Guenther Werth¹ — ¹Johannes Gutenberg Universitaet, Institut fuer Physik, D-55099 Mainz — ²Inst. f. Atomic Physics and Spectroscopy, Latvia University, Riga, Latvia.

Ca⁺ ions have been stored in a Penning trap at a B-field of 1.4 Tesla and collisionally cooled to room temperature. An additional radio frequency applied to the trap electrodes served to drive the ions into the trap center. Long lived metastable states were effectively quenched by buffer gas collisions. A Zeeman level of the 4S_1/2 ground state was selectively depleted by laser excitation. A microwave induced transition between the Zeeman levels was detected by a change in the ionic fluorescence intensity. After calibration of the magnetic field by the cyclotron frequency of stored electrons we obtained a g_J–factor of 2.002 261 7 (13) (5× 10⁻⁷). This tests the relativistic contributions to the g_J–factor to about 2%.
Supported by the Deutsche Forschungsgemeinschaft and the Fritz–Thyssen Stiftung.