High Harmonic Analysis Using a COLTRIMS Technique

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Presentation transcript:

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

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

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

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

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

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

COLTRIMS Spectrometer E-field

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

COLTRIMS Detectors

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

COLTRIMS Magnetic Collection Field

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

COLTRIMS Target Jet

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

COLTRIMS Vacuum System

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

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

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

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

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

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

High Harmonic Generation Free Electron Motion

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

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

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

High Harmonic Analysis Divergence

High Harmonic Analysis Divergence

High Harmonic Analysis Divergence

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

High Harmonic Analysis Harmonic Content Energy [eV]

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

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

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

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

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

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

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

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

Pump-Probe Experiment

Pump-Probe Experiment

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

Equations and Parameters

Free Electron Motion Ekin, max = 3.17 Up

Harmonic Sources

Photoelectron Energy Spectrum Energy [eV]

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

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

Equations and Parameters