Kinematically complete measurements of strong eld ionisation with mid-IR pulses

Recent observations of three unique peaks near 1 eV, 100 meV and 1 meV in the electron spectra generated by ionization using intense mid-IR pulses have challenged the current understanding of strong-field (SF) ionization. The results came as a surprise as they could not be reproduced by the standard version of the commonly used SF approximation. We present results showing the simultaneous measurement of all three low energy ranges at high resolution. This capability is possible due to a unique experimental combination of a high repetition rate mid-IR source, which allows probing deep in the quasi-static regime at high data rates, with a reaction microscope, which allows high resolution three dimensional imaging of the electron momentum distribution.Peer ReviewedPostprint (author's final draft

Polyatomic Molecular Structure Retrieval using Laser-Induced Electron Diffraction

Laser-induced electron diffraction is a developing dynamical imaging technique that is already able to probe molecular dynamics at few-femtosecond temporal resolutions and has the potential to reach the sub-femtosecond level. Here we provide the recipe for the extension of the technique to polyatomic molecules and we demonstrate the method by extracting the structure of aligned and anti-aligned acetylene (C₂H₂). We show that multiple bond lengths can be simultaneously imaged at high accuracy including elusive hydrogen containing bonds. Our results open the door to the investigation of larger complex molecules and the realization of a true molecular movie

Polyatomic Molecular Structure Retrieval using Laser-Induced Electron Diffraction

Laser-induced electron diffraction is a developing dynamical imaging technique that is already able to probe molecular dynamics at few-femtosecond temporal resolutions and has the potential to reach the sub-femtosecond level. Here we provide the recipe for the extension of the technique to polyatomic molecules and we demonstrate the method by extracting the structure of aligned and anti-aligned acetylene (C₂H₂). We show that multiple bond lengths can be simultaneously imaged at high accuracy including elusive hydrogen containing bonds. Our results open the door to the investigation of larger complex molecules and the realization of a true molecular movie

Extraction of the Bond Lengths of Aligned Acetylene using Laser-Induced Electron Diffraction

Imaging the dynamics of molecular processes, i.e. the creation of a so-called \u27molecular movie\u27, requires temporal and spatial resolutions on the few-femtosecond and sub-Ångström scales, respectively. Traditional diffraction techniques are currently temporal limited on the hundreds of femtoseconds level. Laser induced electron diffraction (LIED), on the other hand, is based on using strong-field ionisation to probe an objects\u27 structure with its own rescattered electrons. It therefore has an intrinsic temporal resolution on the attosecond to few-femtosecond scale. LIED has been used to image the dynamics of diatomic molecules over 5 fs [1] but the real goal is to apply it to polyatomic molecules that have many possible ionisation and fragmentation channels

Atomic-Scale Imaging of Aligned Poly-Atomic Molecules with Recollision Electron Diffraction

We present accurate extraction of multiple bond lengths for aligned and antialigned C₂H₂ using recollision electron diffraction.We measure bond lengths of 1:20 ± 0:06 °A (C≡C) and 1:06 ± 0:08 °Å (C-H)

Kinematically complete measurements of strong eld ionisation with mid-IR pulses

Recent observations of three unique peaks near 1 eV, 100 meV and 1 meV in the electron spectra generated by ionization using intense mid-IR pulses have challenged the current understanding of strong-field (SF) ionization. The results came as a surprise as they could not be reproduced by the standard version of the commonly used SF approximation. We present results showing the simultaneous measurement of all three low energy ranges at high resolution. This capability is possible due to a unique experimental combination of a high repetition rate mid-IR source, which allows probing deep in the quasi-static regime at high data rates, with a reaction microscope, which allows high resolution three dimensional imaging of the electron momentum distribution.Peer Reviewe

Kinematically complete measurements of strong field ionization with mid-IR pulses

Abstract Recent observations of three unique peaks near 1 eV, 100 meV and 1 meV in the electron spectra generated by ionization using intense mid-IR pulses have challenged the current understanding of strong-field (SF) ionization. The results came as a surprise as they could not be reproduced by the standard version of the commonly used SF approximation. We present results showing the simultaneous measurement of all three low energy ranges at high resolution. This capability is possible due to a unique experimental combination of a high repetition rate mid-IR source, which allows probing deep in the quasi-static regime at high data rates, with a reaction microscope, which allows high resolution three dimensional imaging of the electron momentum distribution

Diffraction Imaging of Dissociation Channels of Acetylene with Few-Femtosecond Resolution

In order to probe molecular dynamics at few-femtosecond resolution we use laserinduced electron diffraction imaging driven by mid-IR electric waveforms. Combined with coincidence detection we can extract structural information of fragmentation pathways of acetylene

Ultrafast Molecular Structure Determination of Fragmentation Pathways of Acetylene

We apply laser-induced electron diffraction imaging driven by mid-IR electric waveforms towards probing molecular dynamics at few-femtosecond temporal resolutions. Combined with coincidence detection we can extract structural information of fragmentation pathways of acetylene

Sub-Ångström Scale Imaging of Aligned Acetylene

We present the simultaneous measurement of the C-C and C-H bond lengths of aligned acetylene. Our approach combines an ultrafast 160 kHz mid-IR source with 3D electron-ion coincidence detection towards imaging of molecular dynamics