Energies and hyperfine splittings of the 7 D levels of atomic francium
2000; American Physical Society; Volume: 62; Issue: 5 Linguagem: Inglês
10.1103/physreva.62.052507
ISSN1538-4446
AutoresJoshua M. Grossman, R. Fliller, T. E. Mehlstäubler, L. A. Orozco, M. R. Pearson, G. D. Sprouse, W. Z. Zhao,
Tópico(s)Advanced Frequency and Time Standards
ResumoWe report optical double-resonance spectroscopy to locate and study the ${7D}_{3/2}$ and ${7D}_{5/2}$ levels of a sample of ${}^{210}\mathrm{Fr}$ atoms confined and cooled in a magneto-optical trap. The upper state of the ${7P}_{3/2}$ trapping transition serves as the resonant intermediate level to reach the $7D$ states. The energy difference to the ground state is measured for the accessible levels. We measure the hyperfine splittings: $\ensuremath{\Delta}{(7D}_{3/2},F=15/2\ensuremath{\leftrightarrow}13/2)=167\ifmmode\pm\else\textpm\fi{}4 \mathrm{MHz},$ $\ensuremath{\Delta}{(7D}_{5/2},F=17/2\ensuremath{\leftrightarrow}15/2)=\ensuremath{-}117.5\ifmmode\pm\else\textpm\fi{}2.5 \mathrm{MHz},$ and $\ensuremath{\Delta}{(7D}_{5/2},F=15/2\ensuremath{\leftrightarrow}13/2)=\ensuremath{-}121\ifmmode\pm\else\textpm\fi{}4$ MHz. Extrapolating the energies of the inaccessible hyperfine levels from the hyperfine constants and assuming ${B(7D}_{3/2})=0,$ the center-of-gravity energy difference to the ground state is ${E(7D}_{3/2})=24244.831\ifmmode\pm\else\textpm\fi{}0.003 {\mathrm{cm}}^{\ensuremath{-}1}$ and ${E(7D}_{5/2})=24333.298\ifmmode\pm\else\textpm\fi{}0.003 {\mathrm{cm}}^{\ensuremath{-}1}.$
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