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High Harmonic Analysis Using a COLTRIMS Technique Ben Gramkow November 2, 2005

High Harmonic Analysis Using a COLTRIMS Technique Ben Gramkow November 2, 2005. Outline. COLTRIMS High Harmonics Pump-Probe Experiment. Outline. COLTRIMS High Harmonics Pump-Probe Experiment. COLTRIMS. COL d T arget R ecoil- I on M omentum S pectroscopy. Spectrometer Detectors

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High Harmonic Analysis Using a COLTRIMS Technique Ben Gramkow November 2, 2005

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  1. High Harmonic Analysis Using a COLTRIMS Technique Ben Gramkow November 2, 2005

  2. Outline • COLTRIMS • High Harmonics • Pump-Probe Experiment

  3. Outline • COLTRIMS • High Harmonics • Pump-Probe Experiment

  4. COLTRIMS COLd Target Recoil-Ion Momentum Spectroscopy • Spectrometer • Detectors • Magnetic Collection Field • Target Jets • Vacuum System

  5. COLTRIMS Spectrometer & Detectors

  6. COLTRIMS COLd Target Recoil-Ion Momentum Spectroscopy • Spectrometer • Detectors • Magnetic Collection Field • Target Jets • Vacuum System

  7. COLTRIMS Spectrometer E-field

  8. COLTRIMS COLd Target Recoil-Ion Momentum Spectroscopy • Spectrometer • Detectors • Magnetic Collection Field • Target Jets • Vacuum System

  9. COLTRIMS Detectors

  10. COLTRIMS COLd Target Recoil-Ion Momentum Spectroscopy • Spectrometer • Detectors • Magnetic Collection Field • Target Jets • Vacuum System

  11. COLTRIMS Magnetic Collection Field

  12. COLTRIMS COLd Target Recoil-Ion Momentum Spectroscopy • Spectrometer • Detectors • Magnetic Collection Field • Target Jets • Vacuum System

  13. COLTRIMS Target Jet

  14. COLTRIMS COLd Target Recoil-Ion Momentum Spectroscopy • Spectrometer • Detectors • Magnetic Collection Field • Target Jets • Vacuum System

  15. COLTRIMS Vacuum System

  16. COLTRIMS Vacuum System 0.44 torr 1.2x10-5 torr 2.7x10-8 torr

  17. Outline • COLTRIMS • High Harmonics • Pump-Probe Experiment

  18. High Harmonic Generation • Three Step HHG Model • Ionization • Free Electron Motion • Recombination • High Harmonic Analysis • Divergence • Harmonic Content • Flux

  19. High Harmonic Generation • Three Step HHG Model • Ionization • Free Electron Motion • Recombination • High Harmonic Analysis • Divergence • Harmonic Content • Flux

  20. High Harmonic Generation Ionization < 1014 W/cm2 1014 - 1015 W/cm2 > 1015 W/cm2 Multi-photon Processes (ATI) Tunneling Ionization Over the Barrier Ionization

  21. High Harmonic Generation • Three Step HHG Model • Ionization • Free Electron Motion • Recombination • High Harmonic Analysis • Divergence • Harmonic Content • Flux

  22. High Harmonic Generation Free Electron Motion

  23. High Harmonic Generation • Three Step HHG Model • Ionization • Free Electron Motion • Recombination • High Harmonic Analysis • Divergence • Harmonic Content • Flux

  24. High Harmonic Generation Recombination • Two photons per optical cycle • Doubled frequency separation

  25. High Harmonic Generation • Three Step HHG Model • Ionization • Free Electron Motion • Recombination • High Harmonic Analysis • Divergence • Harmonic Content • Flux

  26. High Harmonic Analysis Divergence

  27. High Harmonic Analysis Divergence

  28. High Harmonic Analysis Divergence

  29. High Harmonic Generation • Three Step HHG Model • Ionization • Free Electron Motion • Recombination • High Harmonic Analysis • Divergence • Harmonic Content • Flux

  30. Energy [eV] High Harmonic Analysis Harmonic Content

  31. High Harmonic Analysis Time of Flight Spectra Electrons Recoil Ions Time of Flight [ns] Time of Flight [ns]

  32. radius [mm/2] radius [mm/2] High Harmonic Analysis Wiggle Spectrum Time of Flight [ns] Time of Flight [ns]

  33. High Harmonic Analysis Momentum Spectra Pz vs. Px [a.u.] Pz vs. Py [a.u.]

  34. 19th 21st 23rd 25th Energy [eV] High Harmonic Analysis Photoelectron Energy Spectrum

  35. High Harmonic Generation • Three Step HHG Model • Ionization • Free Electron Motion • Recombination • High Harmonic Analysis • Divergence • Harmonic Content • Flux

  36. High Harmonic Analysis Flux • Two orders of magnitude low • We have not sought to maximize it.

  37. Outline • COLTRIMS • High Harmonics • Pump-Probe Experiment

  38. Pump-Probe Experiment • Laser pump, x-ray probe • Well-defined probe energy • Valence Electrons • Inner-Shell Electrons

  39. Pump-Probe Experiment

  40. Pump-Probe Experiment

  41. Closing Remarks Our high harmonics can be examined with COLTRIMS. Our laser pulse duration and intensity lets follow the dynamics of the lightest molecules.

  42. Equations and Parameters

  43. Free Electron Motion Ekin, max = 3.17 Up

  44. Harmonic Sources

  45. Energy [eV] Energy [eV] Photoelectron Energy Spectrum

  46. Photoelectron Energy Spectrum Harmonic Order

  47. 19th 21st 23rd 25th Photoelectron Energy Spectrum

  48. Equations and Parameters

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