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Precision Spectroscopy of the 9s and 8p levels of Francium.

This study focuses on precision spectroscopy of Francium's 9s and 8p levels to probe electronic wavefunctions and test relativistic wavefunction models. Lifetimes and hyperfine splitting measurements are conducted, with theoretical predictions supporting the experimental results.

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Precision Spectroscopy of the 9s and 8p levels of Francium.

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  1. Precision Spectroscopy of the 9s and 8p levels of Francium. by Seth Aubin Graduate Students: Eduardo Gomez Kerim Gulyuz Jerry Sell Professors: Luis A. Orozco Gene D. Sprouse Work supported by NSF University of Toronto

  2. Precision Spectroscopy in Francium Objective: Spectroscopy probes electronic wavefunctions • Lifetime  wavefunctions far from nucleus • Hyperfine splitting  wavefunction near nucleus • Importance: • Francium is the heaviest alkali (Z=87). • Test of wavefunctions in relativistic regime. • Parity non-conservation experiments.

  3. Excitation of the 9s level of 210Fr

  4. E1 decay channels of the 9s and 8p levels

  5. Lifetime Measurements: Time-correlated Single-photon Counting ~10,000 210Fr atoms

  6. 9s lifetime data and fit

  7. Results for 9S1/2 Lifetime Error% Statistical ± 0.72 TAC/MCA performance < ± 0.04 Displacement error from Rb < ± 0.38 Quantum beats < ± 0.20 Total± 0.84 % Opt. Lett. 28, 2055 (2003)

  8. 8p lifetimes

  9. Results for 8P3/2 Lifetime Error% Statistical ± 1.05 Bayesian (9S1/2) ± 1.44 TAC/MCA performance < ± 0.30 Contamination shift error ± 0.03 Total± 1.8 %

  10. Results for 8P1/2 Lifetime Error% Statistical ± 2.3 Bayesian ± 0.4 TAC/MCA performance < ± 0.2 Total± 2.3 %

  11. Hyperfine Splitting (HFS) Method: • Scan probe laser across F=11/2 and F=13/2 hyperfine levels of the 9S1/2 level. • Record fluorescence vs. frequency With wavemeter: HFS = 4045.2  1.5 MHz (statistical)

  12. SUMMARY • Measurements of the 9S1/2lifetime and HFS. • Measurements of the 8P3/2 and 8P1/2lifetimes. • Theoretical predictions agree with lifetime measurements. • Future: use HFS to extract nuclear g-factor for 210Fr.

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