Abstract
High resolution laser spectroscopy coupled to a sensitive method of detection via mass analysis of He + 2 ions produced in He(5 3P) + He(1 1S) collisions, is used to obtain the fine and hyperfine spectra of the ultra-violet He 2 3S → 5 3P transition. A cw tunable UV radiation around 294.5 nm is generated by intracavity frequency doubling a Rhodamine 6G single mode ring dye laser using an ADA crystal. Both spectra enable fine and hyperfine structures to be determined within a few MHz. The magnetic dipole coupling constant A of the 5 3P term of 3He is found to be -4326 ± 9 MHz (-0.1443 ± 0.0003 cm -1).
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