Hyperfine structure and isotope shifts in 733.2 nm mixed forbidden line of Pb I

Studies of the hyperfine structure and isotope shifts in 733.2 nm mixed (M1+E2) multipole line of Pb I are presented. As a light source the electrodeless discharge tube was used. The high resolution spectral apparatus consisted of a silver coated Fabry-Perot etalon and a grating spectrograph combined with a CCD camera used as a detector. In the analysis of the spectra a computer simulation technique was used. The experiments with the isotope ²⁰⁷Pb yielded the hyperfine structure splitting constant A for the ³P₁ and ¹D₂ levels of the 6s²6p² ground configuration. In the experiment with natural lead the isotope shifts between four stable isotopes (204, 206, 207, 208) were measured.