Saturation spectroscopy with resonance-ionization mass spectrometry detection was used to obtain Doppler-free spectra of the <sup>2</sup><i>D</i>°<sub>3/2</sub> ← <sup>2</sup><i>D</i><sub>3/2</sub> transition of lutetium at 22 125 cm<sup>−1</sup> in unenriched, naturally occurring samples. Analysis of the spectra yielded the hyperfine coupling constants of <sup>175</sup>Lu and <sup>176</sup>Lu for this transition. Applications to isotopically selective photoionization and large-ratio isotopic analysis are discussed.
© 1990 Optical Society of America
Bryan L. Fearey, Denise C. Parent, Richard A. Keller, and Charles M. Miller, "Doppler-free saturation spectroscopy of lutetium isotopes through resonance-ionization mass spectrometry," J. Opt. Soc. Am. B 7, 3-8 (1990)