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

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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