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Measurement of the He 1s2s 1S0 isotopic shift using a tunable VUV anti-Stokes light source

R. W. Falcone, J. R. Willison, J. F. Young, and S. E. Harris

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Abstract

We describe a high-resolution, vacuum-ultraviolet spectroscopic technique based on a tunable, narrow-band, VUV, spontaneous anti-Stokes light source. The technique was used to measure the absolute energies of the 1s2s 1S0 states of 3He and 4He; the 1s2s 1S0 level of 3He is 7.8 ± 0.5 cm−1 below that of 4He.

© 1978 Optical Society of America

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