Abstract
The present paper reports more extensive and precise experimental results about the isotope shifts of Sm I in the 635 nm — 690 nm range by Doppler-free saturation absorption spectroscopy using a single-mode diode laser with a small linewidth. We measured newly the isotope shifts and hyperfine structures of 20 transition lines, which are mostly originating from the [4f 66s 2] 7 F J to [4f 66s6p] 9 D o 9 F o and 7 G o levels, with a resolution better than 8 MHz. The measured isotope shifts were resolved into mass shifts and field shifts by King plot analysis. Finally, we could obtain the changes in mean-square nuclear charge radii from field shifts, and they were compared with the previous results.
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