Controlling Attosecond Double Ionization Dynamics via Molecular Alignment

Zeidler, D.; Staudte, A.; Bardon, Alma; Villeneuve, D. M.; Dørner, R.; Corkum, P. B.

doi:10.1103/physrevlett.95.203003

Cited by 145 publications

(106 citation statements)

References 29 publications

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“…This implies that the second and the fourth quadrant of the p 1 p 2 plane are expected to be populated [16]. A population in such regions of the parallel momentum plane has also been observed for NSDI of diatomic molecules, especially if the molecules in question are aligned perpendicular to the laser-field polarization [19][20][21][22]. Furthermore, it has been recently shown that electron-impact ionization, alone, would not be very useful for retrieving the molecular structure in the experimentally relevant intensity range [23].…”

Section: Introductionmentioning

confidence: 99%

Laser-induced nonsequential double ionization at and above the recollision-excitation-tunneling threshold

2010

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We perform a detailed analysis of the recollision-excitation-tunneling (RESI) mechanism in laserinduced nonsequential double ionization (NSDI), in which the first electron, upon return, promotes a second electron to an excited state, from which it subsequently tunnels, based on the strong-field approximation. We show that the shapes of the electron momentum distributions carry information about the bound-state with which the first electron collides, the bound state to which the second electron is excited, and the type of electron-electron interaction. Furthermore, one may define a driving-field intensity threshold for the RESI physical mechanism. At the threshold, the kinetic energy of the first electron, upon return, is just sufficient to excite the second electron. We compute the distributions for helium and argon in the threshold and above-threshold intensity regime. In the latter case, we relate our findings to existing experiments. The electron-momentum distributions encountered are symmetric with respect to all quadrants of the plane spanned by the momentum components parallel to the laser-field polarization, instead of concentrating on only the second and fourth quadrants.

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Section: Introductionmentioning

confidence: 99%

Laser-induced nonsequential double ionization at and above the recollision-excitation-tunneling threshold

2010

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“…N 2 represents one of the simplest few-electron diatomic systems, and its interaction with light has been extensively studied experimentally as well as theoretically. A wealth of results has been reported for single-photon interactions (see, e.g., [86,[112][113][114][115][116][117][118][119], fragmentation by intense laser fields [83,84], two-colour time-resolved studies [73], and highresolution electron impact coincidence measurements [120]. Recently, several experiments on multiple ionization of N 2 by few EUV photons have been performed at FLASH and SCSS.…”

Section: Multiple Fragmentation Of N 2 Moleculementioning

confidence: 99%

Exploring few-photon, few-electron reactions at FLASH: from ion yield and momentum measurements to time-resolved and kinematically complete experiments

Rudenko

Jiang

Курка

et al. 2010

J. Phys. B: At. Mol. Opt. Phys.

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Abstract:In this contribution we briefly review a series of recent pioneering experiments on fewphoton-induced multiple fragmentation of atoms and molecules performed at the Free electron LASer at Hamburg (FLASH) using a "Reaction Microscope", i.e., a coincident momentum imaging technique. For atoms we consider the most basic non-linear process, namely direct or sequential two-photon double ionization (TPDI). In particular benchmark data for theory are presented such as recoil-ion momentum distributions for direct TPDI of He and Ne, and fully differential data for sequential TPDI of Ne. For molecules we show how one can identify contributions from different reaction channels by inspecting the measured kinetic energy and angular distributions of ionic fragments, and even infer the time-delay between the two photon absorption events in TPDI by detailed comparison with theory.Finally, we describe a novel split mirror arrangement for EUV-pump -EUV-probe experiments, and present the very first time-resolved data on the dynamics of N 2 molecules irradiated by the FLASH light.

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“…So far most experimental studies of ionization of molecules by ultrashort pulses have made use of the Ti:sapphire laser at ∼800 nm central wavelength [83][84][85][86][87][88][89][90][91][92]. For this wavelength, ionization requires the absorption of many photons, which makes the process highly non perturbative even at relatively low intensities (e.g., 10 12 W/cm 2 ).…”

Section: Ionization Of H 2 By Ultrashort Vuv Laser Pulsesmentioning

confidence: 99%

Molecular ionization and dissociation using synchrotron radiation and ultrashort laser pulses

Martín¹

2007

J. Phys.: Conf. Ser.

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Abstract. An overview of recent theoretical progress to accurately describe non dissociative and dissociative ionization of molecules exposed to synchrotron radiation and ultrashort uv/xuv laser pulses is presented. The success of recent theoretical approaches rely on their ability to account for both the electronic and nuclear degrees of freedom. This is essential to describe the delicate interplay between the electronic motion and the molecule's vibration, especially in those cases where ionization occurs in a time scale comparable to that of the vibrational motion. Some of the most successful applications and the new physics that has emerged by comparing with recent kinematically complete experiments on H2 and D2 will be discussed. IntroductionMolecular ionization is one of the most elementary processes that occurs in the upper atmosphere [1] and in interstellar molecular clouds [2]. Since in molecules the absorbed energy is shared between electronic and nuclear degrees of freedom, the remaining molecular ion can be left in an excited vibrational or dissociative state. This is at variance with atomic ionization where the energy is entirely absorbed by the electrons. In early pictures of molecular ionization, the nuclear motion was either ignored or described in terms of the Franck-Condon (FC) approximation, in which electronic processes occurring at the equilibrium position of the nuclei are weighted by the squared overlap between the initial and final vibrational states. With the advent of kinematically complete experiments [3,4], in which the momenta of all charged particles is determined, new phenomena with an intrinsic molecular origin have been discovered (see, e.g., [5][6][7][8][9][10][11]). Also the above pictures have been revealed to be incomplete. In this manuscript, the important role of nuclear dynamics in molecular ionization produced by synchrotron radiation and ultrashort pulses will be demonstrated by means of recent ab initio theoretical calculations that account for all electronic and vibrational degrees of freedom.In particular, recent results for electron angular distributions from fixed-in-space molecules will be analyzed and compared with kinematically complete photoionization experiments using synchrotron radiation. These include double and single photoionization of H 2 (D 2 ). The range of excess photon energies considered goes from a few to several hundreds of eV. Also, multiphoton ionization of molecules by vuv ultrashort pulses will be discussed. In particular, the new physics that can be expected by varying pulse duration and intensity will be analyzed.

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Controlling Attosecond Double Ionization Dynamics via Molecular Alignment

Cited by 145 publications

References 29 publications

Laser-induced nonsequential double ionization at and above the recollision-excitation-tunneling threshold

Laser-induced nonsequential double ionization at and above the recollision-excitation-tunneling threshold

Exploring few-photon, few-electron reactions at FLASH: from ion yield and momentum measurements to time-resolved and kinematically complete experiments

Molecular ionization and dissociation using synchrotron radiation and ultrashort laser pulses

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