Measurement of the He 1s2s (1)S(0) isotopic shift using a tunable VUV anti-Stokes light source.
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 (1)S(0) states of (3)He and (4)He; the 1s2s (1)S(0) level of (3)He is 7.8 +/- 0.5 cm(-1) below that of (4)He.
Falcone
R W
RW
Willison
J R
JR
Young
J F
JF
Harris
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SE