Abstract.We have performed a laser microwave double resonance experiment on 43Ca+ ions stored in a Paul ion trap. The ground state hfs splitting has been determined to A v = 3 225 608286. 4(3)Hz. The value is corrected for small Zeeman, Stark and second order Doppler shifts as well as for light shift effects caused by the laserfields. The uncertainty is mainly determined by the errors of these corrections.

Abstract. The lit~times of both metastable 3D-levels of Ca + have been measured using the ion storage technique. Operation at UHV-conditions eliminated the earlier reported problems of collisional finestructure mixing between those states [1], which is inherent to measurements at buffergas background. The results of "c(D3/2) = ] 113(45) ms and x(Ds/2)= 1054(61) ms improve our earlier result [1] by almost one order of magnitude and are in good agreement with recent theoretical calculations [3,4,5].

Abstract. The lifetime of the metastable 3 D3/2 and 3 Ds/2 states of Ca + ions is determined in a r.f. ion trap by laser excitation of this levels and subsequent time delayed probing of the state population by a second laser. In a buffer gas atmosphere of about 1 0 -s -1 0 -6 mbar of He we observe quenching to the ground state and strong finestructure mixing of the two D-states. This mixing allowes only the determination of the combined lifetime. Our result of z(3D)= 1.24 (39) s is in good agreement with theoretical calculations.

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