1. Hyperfine Studies of Lithium using Saturated Absorption Spectroscopy Tory Carr Advisor: Dr. Alex Cronin

2. Hyperfine Structure of 6 Li & 7 Li

3. Normal Setup

4. Theoretical Limit

5. Problem Doppler Broadening “smears out” resolution Doppler Broadening “smears out” resolution

6. Normal Setup Theory at 375 C

7. Saturated Absorption Setup

8. New Spectrum

9. Saturated Absorption Signal Data collected at 375 C

10. Light as seen from the atoms Pump beam probe beam v0v0

11. Population Difference

12. Scan in frequency +dv -dv 0

13. Theoretical Model

14. Isotope/ Transition Difference

15. Variation with Buffer Gas Pressure

16. Temperature variation

17. Temperature variation- diff sig

18. Maximum in difference signal Maximum Signal When:

19. Conclusion Limiting Factors in resolution Limiting Factors in resolution –Other broadening mechanisms –Residual Doppler broadening Improvements to setup Improvements to setup –Improved alignment –Reduce laser linewidth Further experiments Further experiments –Effects of polarization –Magnetic field effects