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Photon Assisted Cold Collisions in a Rb MOT

Photon Assisted Cold Collisions in a Rb MOT. 10/05/2005. Marc Trachy. B. D. DePaola, M. H. Shah, H. A. Camp. Now at IDA. Intuitive Picture (or Hot Atoms). Atom*. Atom*. Step 1: Add photons. Atom*. Atom*. Step 2: Collide. e -. Step 3: Ionize (Penning or Associative). Atom. Ion.

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Photon Assisted Cold Collisions in a Rb MOT

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  1. Photon Assisted Cold Collisions in a Rb MOT 10/05/2005 Marc Trachy B. D. DePaola, M. H. Shah, H. A. Camp Now at IDA

  2. Intuitive Picture (or Hot Atoms) Atom* Atom* Step 1: Add photons Atom* Atom* Step 2: Collide e- Step 3: Ionize (Penning or Associative) Atom Ion Atom Atom Step 1.5: Decay

  3. Rb Energy Levels Atomic Molecular 4d L2 (1529 nm) 5p L1 (780 nm) 5s

  4. Three Basic Processes Photo-associative ionization (PAI): PAI2-1: PAI2-2: Photo-associo-dissociative ionization (PADI):

  5. History Photo-associative ionization • Na trapping • Metastable Xe • Li Photo-assio-dissociative ionization • Nothing! Conclusion: This could be interesting! Previous Work

  6. RESULTS

  7. Time of Flight PAI PADI Note PADI width Note PAI height

  8. Note: Rates 2 PAI Channels 1 PADI Channel

  9. PADI/PAI PAI2-1/PAITotal

  10. Transformation WIDTH

  11. What Next? What Do We Know? • More Measurements • Dependence on laser frequency • Better energy spectrum • Explanations • ID two PAI peaks • Structure in PADI peaks • ID curves involved • Inter-nuclear separation • Change with detuning? • PADI/PAI ratio vs Intensity • Quasi-molecule PADI • Molecular PAI • PADI energy distribution

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