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We present a measurement of the lifetime of the metastable 3d 2D5/2 state inthe 40Ca+ ion, using the so-called shelving technique on a string of fiveDoppler laser-cooled ions in a linear Paul trap. A detailed account of the dataanalysis is given, and systematic effects due to unwanted excitation processesand collisions with background gas atoms are discussed and estimated. From atotal of 6805 shelving events, we obtain a lifetimetau=1149+/-14(stat.)+/-4(sys.)ms, a result which is in agreement with the mostrecent measurements.Comment: 10 pages, 7 figures. Submitted for publicatio

physical review. a, atomic, molecular, and optical physics/physical review, a, atomic, molecular, and optical physics

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Lifetime measurement of the metastable3dD5∕22state in the<…