Millimeter Wave Spectroscopy of Cold 85 Rb Atoms JIANING HAN, YASIR JAMIL, PAUL TANNER, DON NORUM, T. F. GALLAGHER University of Virginia Supported by:

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1 Millimeter Wave Spectroscopy of Cold 85 Rb Atoms JIANING HAN, YASIR JAMIL, PAUL TANNER, DON NORUM, T. F. GALLAGHER University of Virginia Supported by: the Air Force Office of Scientific Research

2 Outline Motivation Quantum defects measurements Population transfer Conclusion

3 Motivation Cold rydberg atoms Artificial amorphous solids Automatically evolve into plasma Microwave High resolution spectral probe Manipulate atoms [1] H. Maeda, et al., Science 307, 1757 (2005) Cold rydberg atoms Artificial amorphous solids Automatically evolve into plasma Microwave High resolution spectral probe Manipulate atoms [1] H. Maeda, et al., Science 307, 1757 (2005)

4 Theory Hydrogen atom: Core polarizationOrbital Penetration Alkali atoms:

5 The energy diagram and timing 0 2 4 6 8 T(μs) 480nm dye laser pulse Microwave pulse Field ionization ramp Timing ~480nm 5p 3/2 (n+2)d 5/2 nf Microwave Energy diagram J 5/2 7/2

6 Selective Field Ionization (SFI) Time Voltage Field ionization ramp Oscilloscope trace

7 A typical resonance The line width is about the transform limit of a 5 μs microwave pulse The side peaks are the off resonance excitation of a π pulse The 32d 5/2 -30f 7/2 resonance. The microwave pulse length is about 5μs. 200kHz

8 Results The quantum defects of f 5/2,7/2 states were fitted to the function: The improved and previous quantum defects are listed in table 1

9 Results If we fit the fine structure intervals between the f 5/2 and f 7/2 by the following function: A = -157.68(25)GHz; B = 1.917(13)THz. The fine structure plots. The small plot is a magnified plot for n*>29. The first two points are cited from: J.Farley and R. Gupta, PRA 15, 1952(1977)

10 Adiabatic Rapid Passage (ARP) Floquet theory [2] To get a large population transfer: Ω [2] J. H. Shirley, Phys. Rev. 138, B979(1965)

11 Population Transfer Time ( μs ) 012 480nm dye laser pulse Chirped microwave pulse Field ionization ramp 38d 36f

12 Conclusion Using microwave as a sensitive spectral probe, we measured the quantum defects of f 5/2,7/2 states. Using a chirped microwave pulse, we can transfer about 80% atoms from d states to f states.


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