Markus Kitzler
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View article: The molecular attoclock: sub-cycle control of electronic dynamics during H<sub>2</sub> double ionization
The molecular attoclock: sub-cycle control of electronic dynamics during H<sub>2</sub> double ionization Open
We introduce and employ the molecular attoclock method. This allows us to simultaneously trace the nuclear and electron dynamics during H 2 fragmentation, and to CEP-control the two-electron emission dynamics on sub-cycle time scales.
View article: Photoelectron Circular Dichroism at the Few-cycle Limit
Photoelectron Circular Dichroism at the Few-cycle Limit Open
Photoelectron circular dichroism (PECD) was investigated for methyloxirane with intense few-cycle pulses. The observed PECD shows a dependence on electron energy. This may signify an influence of the chiral potential on the outgoing electr…
View article: Frustrated double ionization of argon atoms in strong laser fields
Frustrated double ionization of argon atoms in strong laser fields Open
We report coincidence measurements of frustrated double ionization of argon atoms with a reaction microscope. Experimental results show electron trap- ping process during double ionization has a clear transition from the nonsequential to t…
View article: Two-Dimensional Control of Electron Localization in H<sub>2</sub> Dissociation with Elliptically Polarized Few-Cycle Pulses
Two-Dimensional Control of Electron Localization in H<sub>2</sub> Dissociation with Elliptically Polarized Few-Cycle Pulses Open
We demonstrate two-dimensional control over the chargelocalization in H 2 dissociation using elliptically polarized laser pulses. The influences of the CEP and the laser phase at the instant of ionization are investigated.
View article: Disentangling Intracycle Interferences in Photoelectron Momentum Distributions Using Orthogonal Two-Color Laser Fields
Disentangling Intracycle Interferences in Photoelectron Momentum Distributions Using Orthogonal Two-Color Laser Fields Open
We use orthogonally polarized two-color (OTC) laser pulses to separate quantum paths in the multiphoton ionization of Ar atoms. Our OTC pulses consist of 400 and 800 nm light at a relative intensity ratio of 10∶1. We find a hitherto unobse…
View article: Localizing high-lying Rydberg wave packets with two-color laser fields
Localizing high-lying Rydberg wave packets with two-color laser fields Open
We demonstrate control over the localization of high-lying Rydberg wave\npackets in argon atoms with phase-locked orthogonally polarized two-color (OTC)\nlaser fields. With a reaction microscope, we measured ionization signals of\nhigh-lyi…
View article: Localizing High-Lying Rydberg Wave Packets with Orthogonally-Polarized Two-Color Laser Fields
Localizing High-Lying Rydberg Wave Packets with Orthogonally-Polarized Two-Color Laser Fields Open
We demonstrate controlling over the localization of high-lying Rydberg wave packets in argon atoms with orthogonally-polarized two-color laser fields. Experiments and accompanying semiclassical simulations show clear evidences on asymmetri…
View article: Laser-Induced Oxygen Formation from Carbon Dioxide
Laser-Induced Oxygen Formation from Carbon Dioxide Open
We report experiments on the direct observation of O2 formation from CO2 in strong laser fields. Our simulations and pump-probe measurements suggest that CO2 undergos bending motion during strong-field ionization which supports the O2 form…
View article: Enhanced ionization of acetylene in intense laser pulses is due to energy upshift and field coupling of multiple orbitals
Enhanced ionization of acetylene in intense laser pulses is due to energy upshift and field coupling of multiple orbitals Open
Synopsis We describe a new enhanced ionization mechanism for polyatomic molecules. It works via a significant energy up-shift of valence orbitals for stretched bonds and a strong concomitant increase in the coupling between multiple molecu…
View article: Enhanced ionisation of polyatomic molecules in intense laser pulses is due to energy upshift and field coupling of multiple orbitals
Enhanced ionisation of polyatomic molecules in intense laser pulses is due to energy upshift and field coupling of multiple orbitals Open
We present the results of a combined experimental and numerical study on strong-field ionisation of acetylene performed with the aim of identifying the mechanism behind the previously reported surprisingly large multi-electron ionisation p…
View article: Direct observation of a photochemical activation energy: a case study of acetone photodissociation
Direct observation of a photochemical activation energy: a case study of acetone photodissociation Open
The ability to observe and quantify the conversion of electronic potential energy to vibrational kinetic energy in a molecule after photoexcitation is essential to understand and control the outcome of photoinduced molecular fragmentation.…
View article: Publisher's Note: Molecular oxygen observed by direct photoproduction from carbon dioxide [Phys. Rev. A <b>95</b>, 011404(R) (2017)]
Publisher's Note: Molecular oxygen observed by direct photoproduction from carbon dioxide [Phys. Rev. A <b>95</b>, 011404(R) (2017)] Open
Received 13 February 2017DOI:https://doi.org/10.1103/PhysRevA.95.029903©2017 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasAtomic & molecular processes in external fieldsMultiphoton or tunneling ionization & excita…
View article: Numerical investigation of the sequential-double-ionization dynamics of helium in different few-cycle-laser-field shapes
Numerical investigation of the sequential-double-ionization dynamics of helium in different few-cycle-laser-field shapes Open
We investigate sequential double ionization of helium by intense near-circularly polarized few-cycle laser pulses using a semiclassical ionization model with two independent electrons. Simulated ${\mathrm{He}}^{2+}$ ion momentum distributi…
View article: Molecular oxygen observed by direct photoproduction from carbon dioxide
Molecular oxygen observed by direct photoproduction from carbon dioxide Open
Oxygen ($O_2$) is one of the most important elements required to sustain life. The concentration of $O_2$ on Earth has been accumulated over millions of years and has a direct connection with that of $CO_2$. Further, $CO_2$ plays an import…
View article: Imaging the He <sub>2</sub> quantum halo state using a free electron laser
Imaging the He <sub>2</sub> quantum halo state using a free electron laser Open
Significance In bound matter on all length scales, from nuclei to molecules to macroscopic solid objects, most of the density of the bound particles is within the range of the interaction potential which holds the system together. Quantum …
View article: Coincidence spectroscopy of high-lying Rydberg states produced in strong laser fields
Coincidence spectroscopy of high-lying Rydberg states produced in strong laser fields Open
We report on the measurement of electron emission after the interaction of\nstrong laser pulses with atoms and molecules. These electrons originate from\nhigh-lying Rydberg states with quantum numbers up to $n \\lesssim 120$ formed by\nfru…
View article: Fragmentation of long-lived hydrocarbons after strong field ionization
Fragmentation of long-lived hydrocarbons after strong field ionization Open
We experimentally and theoretically investigated the deprotonation process on\nnanosecond to microsecond timescale in ethylene and acetylene molecules,\nfollowing their double ionization by a strong femtosecond laser field. In our\nexperim…
View article: Two-pulse control over double ionization pathways in CO2
Two-pulse control over double ionization pathways in CO2 Open
We visualize and control molecular dynamics taking place on intermediately populated states during different sequential double ionization pathways of CO2 using a sequence of two delayed laser pulses which exhibit different peak intensities…
View article: Slow fragmentation of hydrocarbons after ultrafast laser interaction
Slow fragmentation of hydrocarbons after ultrafast laser interaction Open
We experimentally and theoretically investigated the deprotonation process on nanosecond to microsecond timescale in ethylene and acetylene molecules, following their double ionization by a strong femtosecond laser field. In our experiment…
View article: "Slow" Molecular Fragmentation after Ultrafast Interaction
"Slow" Molecular Fragmentation after Ultrafast Interaction Open
We report experimental observation of "slow" fragmentation from ethylene molecules on nanosecond or even microsecond timescale after their interaction with femtosecond laser pulses. Our results indicate that such fragmentation process orig…
View article: Laser pulse duration can control the breakage of multiple chemical bonds
Laser pulse duration can control the breakage of multiple chemical bonds Open
We show that the interplay of electron removal and nuclear dynamics on the few femtosecond range, controlled by the duration of few-cycle laser pulses, determines the ratio of C2H43+ fragmentation into two respectively three moieties.
View article: High-Lying Rydberg States from Strong Field Interaction
High-Lying Rydberg States from Strong Field Interaction Open
We experimentally observed high-lying (n>238) Rydberg states which are formed through recapture of electrons after strong field interaction in atoms and small molecules using electron and ion coincidence detection. The high-lying Rydberg s…
View article: Two-Pulse Control over Double Ionization Pathways in CO<sub>2</sub>
Two-Pulse Control over Double Ionization Pathways in CO<sub>2</sub> Open
Using a double-pulse scheme we visualize and control molecular dynamics taking place on intermediate states populated during different sequential double ionization pathways of CO2. Exchanging the pulse- sequence can almost completely switc…
View article: Duration of an intense laser pulse can determine the breakage of multiple chemical bonds
Duration of an intense laser pulse can determine the breakage of multiple chemical bonds Open
Control over the breakage of a certain chemical bond in a molecule by an ultrashort laser pulse has been considered for decades. With the availability of intense non-resonant laser fields it became possible to pre-determine femtosecond to …