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Ultrafast Laser Interactions

Ultrafast Laser Interactions. with atoms, molecules, and ions. Jarlath McKenna. Supervisor: Prof. Ian Williams. The Experiment…. QUB Ion Beam Apparatus. The Experiment…. QUB Ion Beam Apparatus. The Experiment…. Aperture. B. QUB Ion Beam Apparatus. Magnet. Ions. The Experiment….

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Ultrafast Laser Interactions

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  1. Ultrafast Laser Interactions with atoms, molecules, and ions Jarlath McKenna Supervisor: Prof. Ian Williams June 2004

  2. The Experiment…. QUB Ion Beam Apparatus June 2004

  3. The Experiment…. QUB Ion Beam Apparatus June 2004

  4. The Experiment…. Aperture B QUB Ion Beam Apparatus Magnet Ions June 2004

  5. The Experiment…. QUB Ion Beam Apparatus June 2004

  6. The Experiment…. QUB Ion Beam Apparatus June 2004

  7. The Experiment…. UCL Neutral Target Apparatus Focussed Laser Beam June 2004

  8. y x z and scanning techniques…. focussed laser direction Intensity Scan ion beam direction June 2004

  9. y x z and scanning techniques…. focussed laser direction Intensity Selective Scan ion beam direction June 2004

  10. y x z and scanning techniques…. focussed laser direction Intensity Selective Scan ion beam direction June 2004

  11. y x z and scanning techniques…. focussed laser direction Intensity Selective Scan ion beam direction June 2004

  12. y x z and scanning techniques…. focussed laser direction Intensity Selective Scan ion beam direction June 2004

  13. y x z and scanning techniques…. focussed laser direction Intensity Selective Scan ion beam direction June 2004

  14. Walker et al PRL, 73, 1227 (1994) …Sequential ionization June 2004

  15. Walker et al PRL, 73, 1227 (1994) …Sequential ionization S June 2004

  16. Walker et al PRL, 73, 1227 (1994) …Nonsequential ionization S NS June 2004

  17. Walker et al PRL, 73, 1227 (1994) …Nonsequential ionization S NS June 2004

  18. Linear Circular Xe → Xe+ Signal (arb.) Z Position (mm) …Xe results!! June 2004

  19. Linear Circular Xe → Xe+ Signal (arb.) Z Position (mm) …Xe results!! June 2004

  20. Linear Circular Xe → Xe2+ Xe+ from Xe Signal (arb.) Signal (arb.) Z Position (mm) Z Position (mm) …Xe results!! June 2004

  21. Linear Circular Xe → Xe3+ Xe2+ from Xe Signal (arb.) Xe+ from Xe Signal (arb.) Signal (arb.) Z Position (mm) Z Position (mm) …Xe results!! June 2004

  22. Linear Circular Xe3+ from Xe Signal (arb.) Xe+→ Xe3+ Xe2+ from Xe Signal (arb.) Xe+ from Xe Signal (arb.) Signal (arb.) Z Position (mm) Z Position (mm) …Xe results!! June 2004

  23. Linear Circular Xe3+ from Xe Xe3+ from Xe+ Signal (arb.) Xe2+→ Xe3+ Xe2+ from Xe Signal (arb.) Xe+ from Xe Signal (arb.) Signal (arb.) Z Position (mm) Z Position (mm) …Xe results!! June 2004

  24. Linear Circular Xe3+ from Xe Xe3+ from Xe+ Xe3+ from Xe2+ Signal (arb.) Xe2+ from Xe Xe+→ Xe2+ Signal (arb.) Xe+ from Xe Signal (arb.) Signal (arb.) Z Position (mm) Z Position (mm) …Xe results!! June 2004

  25. 0 w 0 1ssg v = 9 -1 2psu v = 5 w 1 v = 4 v = 3 -2 Field-dressed potential energy (eV) v = 0 w 2 -3 -4 w 3 -5 1 2 3 4 5 6 7 8 9 10 Internuclear separation R (a.u.) H neutrals from H2+ Vibrational Trappingin H2+? June 2004

  26. …So what’s next?? Position Sensitive Detector resolve vibrational levels of H2+ Cool vibrational levels of H2+ electrostatic ion trap electric quadrupole Shorter pulses (~10 fs) hollow fibre (gas cell) freeze vibrational motion Frequency double laser (i.e. 800nm → 400nm) larger shift of photon dressed states of H2+ June 2004

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