title: Measurement of the He 1s2s (1)S(0) 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 (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.
authors.forename: R W
authors.initials: RW
authors.lastname: Falcone
authors.forename: J R
authors.initials: JR
authors.lastname: Willison
authors.forename: J F
authors.initials: JF
authors.lastname: Young
authors.forename: S E
authors.initials: SE
authors.lastname: Harris