Precise - and -factor measurements of Ba+ isotopes |
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Authors: | G Marx G Tommaseo G Werth |
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Institution: | Institut für Physik, Johannes Gutenberg Universit?t, 55099 Mainz, Germany, DE
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Abstract: | Laser-microwave double and triple resonance experiments were performed on clouds of Ba+ ions confined in a Penning ion trap to induce and detect electronic and nuclear spin flip transitions. Collisions with buffer
gas molecules in the trap was used to reduce the lifetime of a long lived metastable state of the ions, in which population
trapping might occur, and to cool the ions to the ambient temperature. Loss of ions from the trap by collisions were prevented
by coupling the magnetron and reduced cyclotron motions by an additional r.f. field at the sum frequency of the two motions.
Electronic Zeeman transitions in 138Ba+ and 135Ba+ were observed at a full width of about 3 kHz at a transition frequency of 80 GHz. The uncertainty of the line center was
. From the magnetic field calibration by the cyclotron resonance of electrons stored in the same trap the gJ-factor for both isotopes could be determined to . From radiofrequency induced transitions of 135Ba+ the nuclear g-factor could be determined . Both measurements improve earlier results by about one order of magnitude.
Received: 9 July 1998 / Accepted: 14 July 1998 |
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Keywords: | PACS 21 10 Ky Electromagnetic moments - 32 60 +i Zeeman and Stark effects |
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