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Photon-Assisted Cold Collisions in a Rb MOT: Exploring Ionization Processes

This study investigates photon-assisted cold collisions in a Rubidium Magneto-Optical Trap (MOT), focusing on key processes such as photo-associative ionization (PAI) and photo-associative dissociative ionization (PADI). The research outlines the steps involved, including adding photons, collisions, and ionization mechanisms like Penning and associative ionization. We review previous work on Na, Xe, and Li trapping, analyze time-of-flight data for PAI and PADI, and propose future investigations involving laser frequency dependence and energy distributions. Our findings offer significant insights into atomic interactions and cold chemistry.

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Photon-Assisted Cold Collisions in a Rb MOT: Exploring Ionization Processes

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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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