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Doppler-free saturated absorption spectroscopy is performed on an enrichedradioactive Ar-39 sample. The spectrum of the 3s^2 3p^5 4s [3/2]_2 - 3s^2 3p^54p [5/2]_3 cycling transition at 811.8 nm is recorded, and its isotope shiftbetween Ar-39 and Ar-40 is derived. The hyperfine coupling constants A and Bfor both the 4s [3/2]_2 and 4p [5/2]_3 energy levels in Ar-39 are alsodetermined. The results partially disagree with a recently publishedmeasurement of the same transition. Based on earlier measurements as well asthe current work, the isotope shift and hyperfine structure of thecorresponding transition in Ar-37 are also calculated. These spectroscopic dataare essential for the realization of laser trapping and cooling of Ar-37 andAr-39.

A spectroscopic study of the cycling transition 4s[3/2]_2-4p[5/2]_3 at 811.8 nm in Ar-39: Hyperfine structure and isotope shift