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Ultrafast electron vortex produced by a grating made of light
Zichen Li, Hao Liang, Yuan Gu +9
The generation of vortex matter waves carrying quantized orbital angular momentum is challenging and relies heavily on the material nanofabrication methods due to their extremely s…
Dynamical phase evolution of Coulomb-focused electrons in strong-field ionization probed by a standing light wave
Yuan Gu, Hao Liang, Weiran Zheng +13
We investigate the dynamical phase evolution of Coulomb-focused electrons in strong-field ionization. We diffract the electrons with an ultrashort standing light wave to track thei…
Chiral Electron Momentum Distribution upon Strong-Field Ionization of Atoms
A. Geyer, J. Stindl, I. Dwojak +14
We present a scheme to synthesize a three-dimensional laser field that produces a chiral electron momentum distribution upon strong-field ionization of atoms. Our approach employs…
Sub-cycle resolved strong field ionization of chiral molecules and the origin of chiral photoelectron asymmetries
M. Hofmann, D. Trabert, A. Geyer +9
We report on strong field ionization of S- and R-propylene oxide in circularly polarized two-color laser fields. We find that the relative helicity of the two single color laser fi…
Ideal Two-Color Field Ratio for Holographic Angular Streaking of Electrons
D. Trabert, A. Geyer, N. Anders +7
We study strong field ionization of molecular hydrogen in highly intense co-rotating two-color (CoRTC) laser fields. The measured electron momentum distributions show alternating h…
Angular dependence of the Wigner time delay upon strong field ionization from an aligned p-orbital
D. Trabert, N. Anders, A. Geyer +7
We present experimental data on the strong-field ionization of the argon dimer in a co-rotating two-color (CoRTC) laser field. We observe a sub-cycle interference pattern in the ph…
Experimental fingerprint of the electron's longitudinal momentum at the tunnel exit in strong field ionization
A. Geyer, D. Trabert, M. Hofmann +7
We present experimental data on the strong field tunnel ionization of argon in a counter-rotating two-color (CRTC) laser field. We find that the initial momentum component along th…
Magnetic-field effect in high-order above-threshold ionization
Kang Lin, Simon Brennecke, Hongcheng Ni +15
We experimentally and theoretically investigate the influence of the magnetic component of an electromagnetic field on high-order above-threshold ionization of xenon atoms driven b…
Photoelectron energy peaks shift against the radiation pressure in strong field ionization
Kang Lin, Sebastian Eckart, Alexander Hartung +8
The photoelectric effect describes the ejection of an electron upon absorption of one or several photons. The kinetic energy of this electron is determined by the photon energy red…
Ultrafast preparation and strong-field ionization of an atomic Bell-like state
S. Eckart, D. Trabert, J. Rist +4
Molecules are many body systems with a substantial amount of entanglement between their electrons. Is there a way to break the molecular bond of a diatomic molecule and obtain two…
Strong Differential Photoion Circular Dichroism in Strong-Field Ionization of Chiral Molecules
K. Fehre, S. Eckart, M. Kunitski +14
We investigate the differential ionization probability of chiral molecules in the strong field regime as a function of the helicity of the incident light. To this end, we analyze t…
Electric Nondipole Effect in Strong-Field Ionization
A. Hartung, S. Brennecke, K. Lin +10
Strong-field ionization of atoms by circularly polarized femtosecond laser pulses produces a donut-shaped electron momentum distribution. Within the dipole approximation this distr…
Angular dependence of the Wigner time delay upon tunnel ionization of
Daniel Trabert, Simon Brennecke, Kilian Fehre +9
More than 100 years after its discovery and its explanation in the energy domain, the duration of the photoelectric effect is still heavily studied. The emission time of a photoele…
Sideband Modulation by Sub-Cycle Interference
S. Eckart, D. Trabert, K. Fehre +9
We experimentally and theoretically show that the electron energy spectra strongly depend on the relative helicity in highly intense, circularly polarized two-color laser fields wh…
Orientation Dependent Dissociative Ionization of H in Strong Elliptic Laser Fields: Modification of the release time through molecular orientation
Arnab Khan, Daniel Trabert, Sebastian Eckart +3
We investigate the photoelectron angular emission distributions obtained by strong field dissociative ionization of H using cold target recoil ion momentum spectroscopy. In cas…
Holographic detection of parity in atomic and molecular orbitals
HuiPeng Kang, Andrew S. Maxwell, Daniel Trabert +8
We introduce a novel and concise methodology to detect the parity of atomic and molecular orbitals based on photoelectron holography, which is more general than the existing scheme…
Magnetic fields alter tunneling in strong-field ionization
A. Hartung, S. Eckart, S. Brennecke +16
When a strong laser pulse induces the ionization of an atom, momentum conservation dictates that the absorbed photons transfer their momentum to the electron and its pa…
Multiphoton Double Ionization of Helium at 394nm - a Fully Differential Experiment
K. Henrichs, S. Eckart, A. Hartung +11
We report on a kinematically complete experiment on strong field double ionization of helium using laser pulses with a wavelength of 394\,nm and intensities of $3.5-5.7\times10^{14…
Direct Experimental Access to the Nonadiabatic Initial Momentum Offset upon Tunnel Ionization
S. Eckart, K. Fehre, N. Eicke +11
We report on the non-adiabatic offset of the initial electron momentum distribution in the plane of polarization upon single ionization of argon by strong field tunneling and show…
Timing Recollision in Nonsequential Double Ionization by Intense Elliptically Polarized Laser Pulses
H. Kang, K. Henrichs, M. Kunitski +10
We examine correlated electron and doubly charged ion momentum spectra from strong field double ionization of Neon employing intense elliptically polarized laser pulses. An ellipti…
Double-slit photoelectron interference in strong-field ionization of the neon dimer
Maksim Kunitski, Nicolas Eicke, Pia Huber +13
Wave-particle duality is an inherent peculiarity of the quantum world. The double-slit experiment has been frequently used for understanding different aspects of this fundamental c…
Ultrafast Preparation and Detection of Ring Currents in Single Atoms
Sebastian Eckart, Maksim Kunitski, Martin Richter +16
Quantum particles can penetrate potential barriers by tunneling (1). If that barrier is rotating, the tunneling process is modified (2,3). This is typical for electrons in atoms, m…
Determination of the He-He, Ne-Ne, Ar-Ar, and H interaction potential by wave function imaging
S. Zeller, M. Kunitski, J. Voigtsberger +10
We report on a direct method to measure the internuclear potential energy curve of diatomic systems. A COLTRIMS reaction microscope was used to measure the squares of the vibration…
The role of spin and angular momentum in strong-field ionization
D. Trabert, A. Hartung, S. Eckart +7
The spin polarization of electrons from multiphoton ionization of Xe by 395 nm circularly polarized laser pulses at W/cm has been measured. At this photon energ…