Publications (25)
Steering proton migration in hydrocarbons using intense few-cycle laser fields
M. Kübel, R. Siemering, C. Burger +10
Proton migration is a ubiquitous process in chemical reactions related to biology, combustion, and catalysis. Thus, the ability to control the movement of nuclei with tailored ligh…
Molecular structure retrieval directly from laboratory-frame photoelectron spectra in laser-induced electron diffraction
A. Sanchez, K. Amini, S. -J. Wang +12
Ubiquitous to most molecular scattering methods is the challenge to retrieve bond distance and angle from the scattering signals since this requires convergence of pattern matching…
Imaging Molecular Structure through Femtosecond Photoelectron Diffraction on Aligned and Oriented Gas-Phase Molecules
R. Boll, A. Rouzee, M. Adolph +49
This paper gives an account of our progress towards performing femtosecond time-resolved photoelectron diffraction on gas-phase molecules in a pump-probe setup combining optical la…
Multi-sideband interference structures by high-order photon-induced continuum-continuum transitions in helium
D. Bharti, H. Srinivas, F. Shobeiry +7
Following up on a previous paper on two-color photoionization of Ar(3p) [Bharti et al., Phys. Rev. A 103 (2021) 022834], we present measurements and calculations for a modified thr…
Influence of orbital symmetry on diffraction imaging with rescattering electron wave packets
M. G. Pullen, B. Wolter, A. -T. Le +9
The ability to directly follow and time resolve the rearrangement of the nuclei within molecules is a frontier of science that requires atomic spatial and few-femtosecond temporal…
All-Optical Single-Shot Temporal Characterization of SASE FEL Pulses Using Double-Blind Holography
A. Azzolin, O. Cannelli, K. -F. Wong +31
X-ray Free-electron lasers (XFELs) deliver ultrashort and ultrabright radiation in a photon-energy range spanning from extreme ultraviolet to hard X-rays. Supporting pulse duration…
Time-Resolved Measurement of Interatomic Coulombic Decay in Ne_2
K. Schnorr, A. Senftleben, M. Kurka +24
The lifetime of interatomic Coulombic decay (ICD) [L. S. Cederbaum et al., Phys. Rev. Lett. 79, 4778 (1997)] in Ne_2 is determined via an extreme ultraviolet pump-probe experiment…
Highly efficient double ionization of mixed alkali dimers by intermolecular Coulombic decay
A. C. LaForge, M. Shcherbinin, F. Stienkemeier +4
As opposed to purely molecular systems where electron dynamics proceed only through intramolecular processes, weakly bound complexes such as He droplets offer an environment where…
Fano Resonances observed in Helium Nanodroplets
A. C. LaForge, D. Regina, G. Jabbari +13
Doubly-excited Rydberg states of helium (He) nanodroplets have been studied using synchrotron radiation. We observed Fano resonances related to the atomic N = 2,0 series as a funct…
Watching the acetylene vinylidene intramolecular reaction in real time
Y. H. Jiang, A. Senftleben, A. Rudenko +18
It is a long-standing dream of scientists to capture the ultra-fast dynamics of molecular or chemical reactions in real time and to make a molecular movie. With free-electron laser…
Vectorial optical field reconstruction by attosecond spectral interferometry
P. Carpeggiani, M. Reduzzi, A. Comby +12
An electrical pulse E(t) is completely defined by its time-dependent amplitude and polarisation direction. For optical pulses the manipulation and characterisation of the light pol…
Dopant induced ignition of helium nanodroplets in intense few-cycle laser pulses
S. R. Krishnan, L. Fechner, M. Kremer +13
We demonstrate ultrafast resonant energy absorption of rare-gas doped He nanodroplets from intense few-cycle (~10 fs) laser pulses. We find that less than 10 dopant atoms "ignite"…
Penning ionization of doped helium nanodroplets following EUV excitation
D. Buchta, S. R. Krishnan, N. B. Brauer +11
Helium nanodroplets are widely used as a cold, weakly interacting matrix for spectroscopy of embedded species. In this work we excite or ionize doped He droplets using synchrotron…
Phase- and intensity-resolved measurements of above threshold ionization by few-cycle pulses
M. Kübel, M. Arbeiter, C. Burger +6
We investigate the carrier-envelope phase and intensity dependence of the longitudinal momentum distribution of photoelectrons resulting from above-threshold ionization of argon by…
Ignition of a helium nanoplasma by x-ray multiple ionization of a heavy rare-gas core
D. Schomas, C. Medina, L. Ben Ltaief +14
The dynamics of an x-ray-ionized two-component core-shell nanosystem is probed using doped helium (He) nanodroplets. First, a soft x-ray pump pulse selectively inner-shell ionizes…
Evolution of dopant-induced helium nanoplasmas
S. R. Krishnan, Ch. Peltz, L. Fechner +13
Two-component nanoplasmas generated by strong-field ionization of doped helium nanodroplets are studied in a pump-probe experiment using few-cycle laser pulses in combination with…
EUV ionization of pure He nanodroplets: Mass-correlated photoelectron imaging, Penning ionization and electron energy-loss spectra
D. Buchta, S. R. Krishnan, N. B. Brauer +11
The ionization dynamics of pure He nanodroplets irradiated by EUV radiation is studied using Velocity-Map Imaging PhotoElectron-PhotoIon COincidence (VMI-PEPICO) spectroscopy. We p…
Enabling high-precision 3D strong-field measurements - Ionization with low-frequency fields in the tunneling regime
J. Dura, N. Camus, A. Thai +8
Ionization of an atom or molecule presents surprising richness beyond our current understanding: strong-field ionization with low-frequency fields recently revealed unexpected kine…
Role of intermediate resonances in attosecond photoelectron interferometry in neon
M. Moioli, M. M. Popova, K. R. Hamilton +13
Attosecond photoelectron interferometry based on the combination of an attosecond pulse train and a synchronized infrared field is a fundamental technique for the temporal characte…
Enhanced ionization of embedded clusters by Electron Transfer Mediated Decay in helium nanodroplets
A. C. LaForge, V. Stumpf, K. Gokhberg +13
Here, we report the observation of electron transfer mediated decay (ETMD) involving Mg clusters embedded in helium nanodroplets which is initiated by the ionization of helium foll…
Correlated multi-electron dynamics in ultrafast laser pulse - atom interactions
A. Rudenko, K. Zrost, B. Feuerstein +4
We present the results of the detailed experimental study of multiple ionization of Ne and Ar by 25 and 7 fs laser pulses. For Ne the highly correlated "instantaneous" emission of…
Interatomic Coulombic decay in helium nanodroplets
M. Shcherbinin, A. C. LaForge, V. Sharma +5
Interatomic Coulombic decay (ICD) is induced in helium (He) nanodroplets by photoexciting the n=2 excited state of He^+ using XUV synchrotron radiation. By recording multiple coinc…
Single-shot electron imaging of dopant-induced nanoplasmas
C. Medina, D. Schomas, N. Rendler +19
We present single-shot electron velocity-map images of nanoplasmas generated from doped helium nanodroplets and neon clusters by intense near-infrared and mid-infrared laser pulses…
Resonant Structures in the Low-Energy Electron Continuum for Single Ionization of Atoms in the Tunneling Regime
A. Rudenko, K. Zrost, C. D. Schröter +4
We present results of high-resolution experiments on single ionization of He, Ne and Ar by ultra-short (25 fs, 6 fs) 795 nm laser pulses at intensities 0.15-2.0x10^15 W/cm^2. We sh…
Attosecond electronic recollision as field detector
P. Carpeggiani, M. Reduzzi, A. Comby +10
We demonstrate the complete reconstruction of the electric field of visible-infrared pulses with energy as low as a few tens of nanojoules. The technique allows for the reconstruct…