The optogalvanic spectrum of lutetium in the 5650—6250-Å wavelength range was studied with a cw dye laser and a hollow-cathode lamp. The relative intensities of the observed spectral lines and the classification for some of the new transitions of Lu I are reported. With a single-frequency dye laser as the excitation source in the optogalvanic detection setup, the hyperfine structure of many excited levels of ¹⁷⁵Lu were investigated, and the corresponding hyperfine coupling constants were measured. The hyperfine coupling constants of the 37 193.98-, 37 742.56-, and 39 279.48-cm⁻¹ levels of the 5d6s7s even configuration, the 36 952.93-cm⁻¹ level of the 6s²7d even configuration, and the 43 514.29-cm⁻¹ level of the 6s²25p odd configuration are reported here. For other configurations studied, the present results are compared with the theoretical and experimental values available in the literature.

© 1989 Optical Society of America

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