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Demonstration of MOTRIMS Probing Capability

Demonstration of MOTRIMS Probing Capability. Hai Nguyen, Richard Br é dy, Howard Camp, Takaaki Awata, Kyle Wilson, Brett DePaola. OUTLINE. Motivation Experimental Setup Review of earlier results New Results. MOTIVATION. Collisions with excited target

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Demonstration of MOTRIMS Probing Capability

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  1. Demonstration of MOTRIMS Probing Capability Hai Nguyen, Richard Brédy, Howard Camp, Takaaki Awata, Kyle Wilson, Brett DePaola.

  2. OUTLINE • Motivation • Experimental Setup • Review of earlier results • New Results

  3. MOTIVATION • Collisions with excited target • Cross-section measurements provide rigorous test for TC-AOCC. • Optimizing MOTRIMS capabilities.

  4. EXPERIMENTAL SETUP

  5. PREVIOUS RESULTS7 keV Na+ + Rb (5s, 5p)

  6. PREVIOUS RESULTS7 keV Na+ + Rb (5s, 5p)

  7. PREVIOUS RESULTS7 keV Na+ + Rb (5s, 5p)

  8. PREVIOUS RESULTS7 keV Na+ + Rb (5s, 5p)

  9. PREVIOUS RESULTSCompared to calculation

  10. PREVIOUS RESULTS7 keV Na+ + Rb (5s, 5p)

  11. PREVIOUS RESULTSCompared to calculation 5s-3p 5p-3p (keV mrad) (keV mrad)

  12. Other Collision Systems: Difficulty

  13. CURRENT RESULTS7 keV Li+ + Rb (5s, 5p)

  14. Multi-Projectile Source

  15. From Na+ Contaminant From Previous Results Na+ MOT excited state fraction Probe (Na contaminant)

  16. From measurements of Li+ Unknown Li+ 7 keV Na+ Contaminant

  17. Cross Sections 7 keV Li+ + Rb Waiting for TC-AOCC results

  18. 7 keV Li+ + Rb Scattering Angle Information

  19. 7 keV Li+ + Rb Scattering Angle Information • Grouped scattering angle information are hard to extrapolate (Rb + Rb). • Theoretical Comparison not trustworthy. • Using a weighted method to deduce individual channel scattering angle information.

  20. Q Value (eV) 20 5s-5p 5p-5s 5s-5s 5p-5p TAC time s 5s 0 -1.59 0 1.59 Weighted Method (Rb+ + Rb) • Consider an even more extreme case: Rb+ + Rb collision system, where s-s & p-p are completely overlapped. • Because lasers are turned on/off, we know exactly when capture from 5p not possible. • Weighted by excited state fraction we deduce [Qvs]ss & [Qvs]pp separately.

  21. Q Value (eV) 20 5s-5p 5p-5s 5s-5s 5p-5p TAC time s 5s 0 -1.59 0 1.59 Weighted Method (Rb+ + Rb)

  22. 7 keV Li+ + Rb Scattering Angle Information Laser on Laser off

  23. 7 keV Li+ + Rb Scattering Angle Information

  24. DEVELOPMENTS • Double (multiple) species pellets development technique. • Diode lasers control and implementation. • Technique of analysis.

  25. SUMMARY • Multiple species pellets along with extremely high resolution in Q-value allow us to make ‘in situ’ measurements of excited state fraction and relative cross sections. • Kinematically complete collisions study for energetically degenerate channels. • MOTRIMS is a powerful tool for ion-atom collisions.

  26. DAVLL Sat abs O I /2 REPUMP Com AOM 80MHz Blocker F=40cm TRAPPING OPTICS F=40cm /2 O I TRAP Sat abs DAVLL SIMPLE OPTICS LAYOUT

  27. SIMPLE OPTICS LAYOUT l /2 PBS l /4 Mirror Mirror From AOM l /4 l /2 l /4 Mirror PBS l /4 l /4 Mirror Mirror l /4 Mirror

  28. Mass a.u. 2 keV s 5 keV s 7 keV s 6 8.268E-5 8.548E-5 8.623E-5 23 7.538E-5 8.086E-5 8.232E-5 39 7.087E-5 7.801E-5 7.991E-5 85 6.162E-5 7.216E-5 7.497E-5 133 5.442E-5 6.761E-5 7.112E-5 -- Projected TOF

  29. STIRAP Application

  30. STIRAP Application • MOTRIMS will allow us to monitor relative population. • Gain insights into non-destructive STIRAP physics.

  31. STIRAP Sample Results

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