Isotope shifts in the spectrum of Pb I

Isotope shifts in twelve atomic lines of Pb I: 401.9 nm (6p6d 3F3→6p2 1D2), 405.8 nm (6p7s 3P1→6p2 3P2), 416.9 nm (6p6d 3F2→6p2 1D2), 434.0 nm (6p7d 3D1→6p2 1S0),  500.6 nm (6p7s 1P1→6p2 1S0), 520.3 nm (6p8s 3P1→6p2 1S0), 589.6 nm (6p8p 3D1→6p7s 3P0), 600.2 nm (6p8p 3D2→6p7s 3P1), 601.2 nm (6p8p 3D1→6p7s 3P1), 605.9 nm (6p8p 3P0→6p7s 3P1), 611.0 nm (6p8p 3P1→6p7s 3P0) and 723.1 nm (6p7s 3P1→6p2 1D2) have been measured. As a light source the 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. Our studies enabled us to separate the mass and the field effects and to determine values of changes of the mean square nuclear charge radii.

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