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      Weak-field asymptotic theory of tunneling ionization: benchmark analytical results for two-electron atoms

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          High harmonic interferometry of multi-electron dynamics in molecules.

          High harmonic emission occurs when an electron, liberated from a molecule by an incident intense laser field, gains energy from the field and recombines with the parent molecular ion. The emission provides a snapshot of the structure and dynamics of the recombining system, encoded in the amplitudes, phases and polarization of the harmonic light. Here we show with CO(2) molecules that high harmonic interferometry can retrieve this structural and dynamic information: by measuring the phases and amplitudes of the harmonic emission, we reveal 'fingerprints' of multiple molecular orbitals participating in the process and decode the underlying attosecond multi-electron dynamics, including the dynamics of electron rearrangement upon ionization. These findings establish high harmonic interferometry as an effective approach to resolving multi-electron dynamics with sub-Angström spatial resolution arising from the de Broglie wavelength of the recombining electron, and attosecond temporal resolution arising from the timescale of the recombination event.
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            Attosecond imaging of molecular electronic wavepackets

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              Is Open Access

              Accurate retrieval of structural information from laser-induced photoelectron and high-harmonic spectra by few-cycle laser pulses

              By analyzing ``exact'' theoretical results from solving the time-dependent Schr\"odinger equation of atoms in few-cycle laser pulses, we established the general conclusion that differential elastic scattering and photo-recombination cross sections of the target ion with {\em free} electrons can be extracted accurately from laser-generated high-energy electron momentum spectra and high-order harmonic spectra, respectively. Since both electron scattering and photoionization (the inverse of photo-recombination) are the conventional means for interrogating the structure of atoms and molecules, this result shows that existing few-cycle infrared lasers can be implemented for ultrafast imaging of transient molecules with temporal resolution of a few femtoseconds.
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                Author and article information

                Journal
                Journal of Physics B: Atomic, Molecular and Optical Physics
                J. Phys. B: At. Mol. Opt. Phys.
                IOP Publishing
                0953-4075
                1361-6455
                March 28 2015
                March 28 2015
                March 11 2015
                : 48
                : 6
                : 061003
                Article
                10.1088/0953-4075/48/6/061003
                1d187229-9ee1-40ba-b651-4d64bb0bdaf3
                © 2015

                http://iopscience.iop.org/info/page/text-and-data-mining

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