Angular dependence of the Wigner time delay upon tunnel ionization of $H_2$

Abstract

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 photoelectron can be quantified by the Wigner time delay. Experiments addressing this time delay for single-photon ionization became feasible during the last 10 years. A missing piece, which has not been studied, so far, is the Wigner time delay for strong-field ionization of molecules. Here we show experimental data on the Wigner time delay for tunnel ionization of $H_2$ molecules and demonstrate its dependence on the emission direction of the electron with respect to the molecular axis. We find, that the observed changes in the Wigner time delay can be quantitatively explained by elongated/shortened travel paths of the electrons that are due to spatial shifts of the electron's birth position after tunneling. This introduces an intuitive perspective towards the Wigner time delay in strong-field ionization.

17 pages, 6 figures

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Cited by in corpus (12)

• Ultrafast Kapitza-Dirac effect
• Attosecond Ionization Time Delays in Strong-Field Physics
• Analysis of RABITT time delays using the stationary multi-photon molecular R-matrix approach
• Sideband Modulation by Sub-Cycle Interference
• Phase delays in $\omega -2\omega$ above-threshold ionization
• Quantum interference and imaging using intense laser fields
• Experimental fingerprint of the electron's longitudinal momentum at the tunnel exit in strong field ionization
• Photoelectron momentum distributions in the strong-field ionization of atomic hydrogen by few-cycle elliptically polarized optical pulses
• Angular dependence of the Wigner time delay upon strong field ionization from an aligned p-orbital
• A Physical Interpretation of Imaginary Time Delay
• Superuniversal Statistics of Complex Time-Delays in Non-Hermitian Scattering Systems
• Chiral Electron Momentum Distribution upon Strong-Field Ionization of Atoms