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

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

4. Pump-Probe Experiment
Outline
COLTRIMS
High Harmonics
Pump-Probe Experiment

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

6. COLTRIMS Spectrometer & Detectors
Point out spectrometer and detectors.
Reaction products are directed toward detectors by spectrometer

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

8. COLTRIMS
Spectrometer
E-field

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

10. COLTRIMS
Detectors

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

12. COLTRIMS
Magnetic Collection Field

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

14. COLTRIMS
Target Jet

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

16. COLTRIMS
Vacuum System

17. COLTRIMS
Vacuum System
0.44 torr
1.2x10-5 torr
2.7x torr

18. Pump-Probe Experiment
Outline
COLTRIMS
High Harmonics
Pump-Probe Experiment

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

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

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

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

23. High Harmonic Generation
Free Electron Motion

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

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

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

27. High Harmonic Analysis
Divergence

28. High Harmonic Analysis
Divergence

29. High Harmonic Analysis
Divergence

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

31. High Harmonic Analysis
Harmonic Content
Energy [eV]

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

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

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

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

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

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

38. Pump-Probe Experiment
Outline
COLTRIMS
High Harmonics
Pump-Probe Experiment

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

40. Pump-Probe Experiment

41. Pump-Probe Experiment

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

43. Equations and Parameters

44. Free Electron Motion
Ekin, max = 3.17 Up

45. Harmonic Sources

46. Photoelectron Energy Spectrum
Energy [eV]

47. Photoelectron Energy Spectrum
Harmonic Order
11th
13th
15th
17th
19th
21st
23rd
25th
Ehn [eV]
17.05
20.15
23.25
26.35
29.45
32.55
36.65
39.75
Ehn - Ip [eV]
1.35
4.45
7.55
10.65
13.75
16.85
19.95
23.05
p [a.u.]
0.31
0.57
0.74
0.88
1.01
1.11
1.21
1.3

48. Photoelectron Energy Spectrum
23rd
25th
21st
19th
11th
13th
15th
17th
19th
21st
23rd
25th
Ehn [eV]
17.05
20.15
23.25
26.35
29.45
32.55
36.65
39.75
Ehn - Ip [eV]
1.35
4.45
7.55
10.65
13.75
16.85
19.95
23.05
p [a.u.]
0.31
0.57
0.74
0.88
1.01
1.11
1.21
1.3

49. Equations and Parameters