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

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. Precision Spectroscopy in Francium. Objective:

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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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