Ion storage technique for very long living states: The decay rate of the 5D
3/2 state of Ba II |
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Authors: | R Schneider G Werth |
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Institution: | 1. Institut für Physik, Universit?t Mainz, Mainz, Federal Republic of Germany
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Abstract: | The metastable 5D 3/2 state of Ba+ is used to demonstrate the possibility of the ion storage technique for the measurement of extremely long lived states. The ions are confined in a r.f. quadrupole trap and excited by a strong pulsed tunable dye laser to the 6P 1/2 state which partially decays into the 5D 3/2 state. Sampling of the time development of the ground state population leads to the determination of the 5D 3/2 decay rate. Using He as a buffer gas at a pressure of about 10?6 mbar to initially store the ions, varying the gas density and extrapolating to zero pressure, we find for the lifetime \(\tau _{D_{3/2} } = 17.5 \pm 4s\) . |
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