Abstract
A beam-foil measurement of the meanlife of the 1s 3p 1 P level in He I has been made and yields the value 1.7225±0.0046 ns. The measurement was made with standard beam-foil techniques and equipment, but special attention was devoted to minimizing sources of uncertainty. The precision far exceeds that of previous beam-foil meanlife measurements and demonstrates that the beam-foil technique is capable of high precision and is competitive with and more flexible than methods such as resonant laser excitation.
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We wish to thank Professor J.O. Stoner, Jr. and Dr. A. Gaupp for their valuable advice and assistance during the early phases of this work. The experience of Dr. L. Lundin in high-precision measurements has provided a source of guidance throughout the experiment. We are finally grateful to Professor I. Bergström for enlightening discussions and to Professor B. Edlén for critically reading the manuscript.
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Astner, G., Curtis, L.J., Liljeby, L. et al. A high precision beam-foil meanlife measurement of the 1s 3p 1 P level in He I. Z Physik A 279, 1–6 (1976). https://doi.org/10.1007/BF01409083
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DOI: https://doi.org/10.1007/BF01409083