Publications
241 results found
Shafir D, Soifer H, Bruner BD, et al., 2012, Resolving the time when an electron exits a tunnelling barrier, NATURE, Vol: 485, Pages: 343-346, ISSN: 0028-0836
- Author Web Link
- Cite
- Citations: 372
Ivanov MY, 2012, PHYSICAL CHEMISTRY Single molecules filmed dancing on a table top, NATURE, Vol: 483, Pages: 161-163, ISSN: 0028-0836
- Author Web Link
- Cite
- Citations: 3
Ivanov M, Bartram D, Smirnova O, 2012, Coherent control in strongly driven multi-level systems: quantum vs classical features, MOLECULAR PHYSICS, Vol: 110, Pages: 1801-1805, ISSN: 0026-8976
- Author Web Link
- Cite
- Citations: 4
Ivanov M, Smirnova O, 2011, How Accurate Is the Attosecond Streak Camera?, PHYSICAL REVIEW LETTERS, Vol: 107, ISSN: 0031-9007
- Author Web Link
- Cite
- Citations: 102
Bondar DI, Liu W-K, 2011, Shapes of leading tunnelling trajectories for single-electron molecular ionization, Journal of Physics A: Mathematical and Theoretical, Vol: 44, Pages: 275301-275301, ISSN: 1751-8113
Murray R, Spanner M, Patchkovskii S, et al., 2011, Tunnel Ionization of Molecules and Orbital Imaging, PHYSICAL REVIEW LETTERS, Vol: 106, ISSN: 0031-9007
- Author Web Link
- Cite
- Citations: 89
Bondar DI, Yudin GL, Liu W-K, et al., 2011, Nonsequential double ionization below laser-intensity threshold: Anticorrelation of electrons without excitation of parent ion, PHYSICAL REVIEW A, Vol: 83, ISSN: 1050-2947
- Author Web Link
- Cite
- Citations: 16
Huismans Y, Rouzee A, Gijsbertsen A, et al., 2011, Time-Resolved Holography with Photoelectrons, SCIENCE, Vol: 331, Pages: 61-64, ISSN: 0036-8075
- Author Web Link
- Cite
- Citations: 455
Kelkensberg F, Sansone G, Ivanov MY, et al., 2011, A semi-classical model of attosecond electron localization in dissociative ionization of hydrogen, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, Vol: 13, Pages: 8647-8652, ISSN: 1463-9076
- Author Web Link
- Cite
- Citations: 50
Bondar DI, Liu W-K, Ivanov MY, 2010, Enhancement and suppression of tunneling by controlling symmetries of a potential barrier, PHYSICAL REVIEW A, Vol: 82, ISSN: 1050-2947
- Author Web Link
- Cite
- Citations: 10
Sukiasyan S, Patchkovskii S, Smirnova O, et al., 2010, Exchange and polarization effect in high-order harmonic imaging of molecular structures, PHYSICAL REVIEW A, Vol: 82, ISSN: 1050-2947
- Author Web Link
- Cite
- Citations: 37
Torres R, Siegel T, Brugnera L, et al., 2010, Extension of high harmonic spectroscopy in molecules by a 1300 nm laser field, OPTICS EXPRESS, Vol: 18, Pages: 3174-3180, ISSN: 1094-4087
- Author Web Link
- Cite
- Citations: 59
Torres R, Siegel T, Brugnera L, et al., 2010, Extension of high harmonic spectroscopy in molecules by a 1300 nm laser field, OPTICS EXPRESS, Vol: 18, Pages: 3174-3180, ISSN: 1094-4087
The emerging techniques of molecular spectroscopy by high order harmonic generation have hitherto been conducted only with Ti:Sapphire lasers which are restricted to molecules with high ionization potentials. In order to gain information on the molecular structure, a broad enough range of harmonics is required. This implies using high laser intensities which would saturate the ionization of most molecular systems of interest, e. g. organic molecules. Using a laser at 1300 nm, we are able to extend the technique to molecules with relatively low ionization potentials (similar to 11 eV), observing wide harmonic spectra reaching up to 60 eV. This energy range improves spatial resolution of the high harmonic spectroscopy to the point where interference minima in harmonic spectra of N2O and C2H2 can be observed. (C) 2010 Optical Society of America
Murray R, Liu WK, Ivanov MY, 2010, Partial Fourier-transform approach to tunnel ionization: Atomic systems, PHYSICAL REVIEW A, Vol: 81, ISSN: 1050-2947
We present physically transparent and computationally simple method for calculating tunnel ionization rates for arbitrary bound states and arbitrary potentials in three dimensions. Here, we verify applicability of the method analytically by demonstrating that it reproduces all known analytical results for tunnel ionization from arbitrary atomic states in a single-center Coulomb potential in the presence of a constant electric field.
Sansone G, Kelkensberg F, Perez-Torres JF, et al., 2010, Electron localization following attosecond molecular photoionization, NATURE, Vol: 465, Pages: 763-U3, ISSN: 0028-0836
For the past several decades, we have been able to directly probe the motion of atoms that is associated with chemical transformations and which occurs on the femtosecond (10(-15)-s) timescale. However, studying the inner workings of atoms and molecules on the electronic timescale(1-4) has become possible only with the recent development of isolated attosecond (10(-18)-s) laser pulses(5). Such pulses have been used to investigate atomic photoexcitation and photoionization(6,7) and electron dynamics in solids(8), and in molecules could help explore the prompt charge redistribution and localization that accompany photoexcitation processes. In recent work, the dissociative ionization of H-2 and D-2 was monitored on femtosecond timescales(9) and controlled using few-cycle near-infrared laser pulses(10). Here we report a molecular attosecond pump-probe experiment based on that work: H-2 and D-2 are dissociatively ionized by a sequence comprising an isolated attosecond ultraviolet pulse and an intense few-cycle infrared pulse, and a localization of the electronic charge distribution within the molecule is measured that depends-with attosecond time resolution-on the delay between the pump and probe pulses. The localization occurs by means of two mechanisms, where the infrared laser influences the photoionization or the dissociation of the molecular ion. In the first case, charge localization arises from quantum mechanical interference involving autoionizing states and the laser-altered wavefunction of the departing electron. In the second case, charge localization arises owing to laser-driven population transfer between different electronic states of the molecular ion. These results establish attosecond pump-probe strategies as a powerful tool for investigating the complex molecular dynamics that result from the coupling between electronic and nuclear motions beyond the usual Born-Oppenheimer approximation.
Mairesse Y, Higuet J, Dudovich N, et al., 2010, High Harmonic Spectroscopy of Multichannel Dynamics in Strong-Field Ionization (vol 104, 213601, 2010), PHYSICAL REVIEW LETTERS, Vol: 104, ISSN: 0031-9007
Mairesse Y, Higuet J, Dudovich N, et al., 2010, High Harmonic Spectroscopy of Multichannel Dynamics in Strong-Field Ionization (vol 104, 213601, 2010), PHYSICAL REVIEW LETTERS, Vol: 104, ISSN: 0031-9007
Smirnova O, Ivanov M, 2010, ULTRAFAST SCIENCE Towards a one-femtosecond film, NATURE PHYSICS, Vol: 6, Pages: 159-160, ISSN: 1745-2473
Balciunas T, Andriukaitis G, Pugzlys A, et al., 2010, Steering of Tunneling Currents by Sub-Cycle Waveform Shaping, 23rd Annual Meeting of the IEEE Photonics-Society, Publisher: IEEE, Pages: 614-+
Niikura H, Bhardwaj B, Legare F, et al., 2010, Ionization of Small Molecules by Strong Laser Fields, Strong Fields Physics, Editors: Brabec
Murray R, Ruiz C, Marangos JP, et al., 2010, Control of diffraction of electron wave packets on diatomic molecules using two-colour fields, JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, Vol: 43, ISSN: 0953-4075
We examine the effect of two perpendicularly polarized fields of different colour on the photoelectron spectrum from an aligned diatomic molecule. We present a comparison of ab inito and S-matrix calculations of laser-induced electron diffraction. Two control schemes are examined, each intended to produce a single recollision event. The parameter space of each control scheme is explored and optimal parameters are found, and we confirm that a single recollision can be achieved.
Torres R, Siegel T, Brugnera L, et al., 2010, Revealing molecular structure and dynamics through high-order harmonic generation driven by mid-IR fields, PHYSICAL REVIEW A, Vol: 81, ISSN: 1050-2947
High-order harmonic generation (HHG) from molecules produces spectra that are modulated by interferences that encode both the static structure and the electron dynamics initiated by interaction with the laser field. Using a midinfrared (mid-IR) laser at 1300 nm, we are able to study the region of the harmonic spectrum containing such interferences in CO2 over a wide range of intensities. This allows for isolation and characterization of interference minima arising due to subcycle electronic dynamics triggered by the laser field, which had previously been identified but not systematically separated. Our experimental and theoretical results demonstrate important steps toward combining attosecond temporal and angstrom-scale spatial resolution in molecular HHG imaging.
Mairesse Y, Higuet J, Dudovich N, et al., 2010, High Harmonic Spectroscopy of Multichannel Dynamics in Strong-Field Ionization, PHYSICAL REVIEW LETTERS, Vol: 104, ISSN: 0031-9007
We perform high harmonic generation spectroscopy of aligned nitrogen molecules to characterize the attosecond dynamics of multielectron rearrangement during strong-field ionization. We use the spectrum and ellipticity of the harmonic light to reconstruct the relative phase between different ionization continua participating in the ionization, and thus determine the shape and location of the hole left in the molecule by strong-field ionization. Our interferometric technique uses transitions between the ionic states, induced by the laser field on the subcycle time scale.
Bondar DI, Murray R, Ivanov MY, 2009, An electron in the presence of multiple zero range potentials and an external laser field -- exact solutions for photoionization and stimulated bremsstrahlung
The method of zero range potential (ZRP) for one-electron problems isreviewed. In the absence of an external electromagnetic field, the notion of aZRP is introduced from different points of view and for an arbitrary dimensionof space. Then, three-dimensional problems of motion of an electron in thefield of several ZRPs and laser radiation are studied. Exact wave functions forthe processes of photoionization and stimulated bremsstrahlung in the presenceof the laser field of an arbitrary pulse shape are obtained in the form ofone-dimensional integral representations.
Smirnova O, Patchkovskii S, Mairesse Y, et al., 2009, Attosecond Circular Dichroism Spectroscopy of Polyatomic Molecules, PHYSICAL REVIEW LETTERS, Vol: 102, ISSN: 0031-9007
We describe the roles of multiple electronic continua in high-harmonic generation from aligned molecules. First, we show how the circularity of emitted harmonics tracks the interplay of different electronic continua participating in the nonlinear response. Second, we show that the interplay of different continua can lead to large variations of harmonic phases. Finally, we show how multiple electronic continua allow one to shape the polarization of high harmonics and attosecond pulses.
Bondar DI, Liu WK, Ivanov MY, 2009, Two-electron ionization in strong laser fields below intensity threshold: Signatures of attosecond timing in correlated spectra, PHYSICAL REVIEW A, Vol: 79, ISSN: 1050-2947
We develop an analytical model of correlated two-electron ionization in strong infrared laser fields. The model includes all relevant interactions between the electrons, the laser field, and the ionic core nonperturbatively. We focus on the deeply quantum regime, where the energy of the active electron driven by the laser field is insufficient to collisionally ionize the parent ion, and the assistance of the laser field is required to create a doubly charged ion. In this regime, the electron-electron and the electron-ion interactions leave distinct footprints in the correlated two-electron spectra, recording the mutual dynamics of the escaping electrons.
Staudte A, Patchkovskii S, Pavicic D, et al., 2009, Angular Tunneling Ionization Probability of Fixed-in-Space H-2 Molecules in Intense Laser Pulses (vol 102, 033004, 2009), PHYSICAL REVIEW LETTERS, Vol: 102, ISSN: 0031-9007
Sukiasyan S, McDonald C, Destefani C, et al., 2009, Multielectron Correlation in High-Harmonic Generation: A 2D Model Analysis, PHYSICAL REVIEW LETTERS, Vol: 102, ISSN: 0031-9007
We analyze the role of multielectron dynamics in high-harmonic generation spectroscopy, using an example of a two-electron system. We identify and systematically quantify the importance of correlation and exchange effects. One of the main sources for correlation is identified to be the polarization of the ion by the recombining continuum electron. This effect, which plays an important qualitative and quantitative role, seriously undermines the validity of the standard approaches to high-harmonic generation, which ignore the contribution of excited ionic states to the radiative recombination of the continuum electron.
Ivanov MY, 2009, “What a Life!”-Nikolay Borisovich Delone, LASER PHYSICS, Vol: 19, Pages: 1500-1501, ISSN: 1054-660X
This essay is dedicated to my personal memories of Nikolay Borisovich Delone, the god-father to Russian strong-field science and to me, the Teacher with capital T, not only in physics but also in life.
Efremov MA, Plimak L, Berg B, et al., 2009, Efimov states in atom-molecule collisions, PHYSICAL REVIEW A, Vol: 80, ISSN: 1050-2947
We analyze scattering of a heavy atom off a weakly bound molecule comprising an identical heavy and a light atom in the Born-Oppenheimer approximation. We focus on the situation where the heavy atoms are bosons, which was realized in several experiments. The elastic and inelastic cross sections for the atom-molecular scattering exhibit a series of resonances corresponding to three-body Efimov states. Resonances in elastic collisions are accessible experimentally through thermalization rates and thus constitute an alternative way of observing Efimov states.
This data is extracted from the Web of Science and reproduced under a licence from Thomson Reuters. You may not copy or re-distribute this data in whole or in part without the written consent of the Science business of Thomson Reuters.