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Infrared diode-laser measurements of some atomic helium (4He i 1s nl) fine-structure transitions

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Abstract

Five transitions in neutral atomic helium involving single-electron-excited S, P, and D levels with n = 3 to 8 and Δn = 0 and 2 have been measured in the mid- and far-infrared regions by using tunable-diode-laser sources. The accuracies of the relevant intervals have thus been improved by a factor of approximately 10 with respect to previous optical measurements. These results should be of use in refining the determination of helium energy levels.

© 1986 Optical Society of America

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