Itzik Ben-Itzhak
Kansas State University
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Publication
Featured researches published by Itzik Ben-Itzhak.
Nature Communications | 2012
Boris Bergues; Matthias Kübel; Nora G. Johnson; Bettina Fischer; Nicolas Camus; K.J. Betsch; Oliver Herrwerth; Arne Senftleben; A. Max Sayler; Tim Rathje; Thomas Pfeifer; Itzik Ben-Itzhak; R. R. Jones; G. G. Paulus; Ferenc Krausz; R. Moshammer; Joachim Ullrich; Matthias F. Kling
Despite their broad implications for phenomena such as molecular bonding or chemical reactions, our knowledge of multi-electron dynamics is limited and their theoretical modelling remains a most difficult task. From the experimental side, it is highly desirable to study the dynamical evolution and interaction of the electrons over the relevant timescales, which extend into the attosecond regime. Here we use near-single-cycle laser pulses with well-defined electric field evolution to confine the double ionization of argon atoms to a single laser cycle. The measured two-electron momentum spectra, which substantially differ from spectra recorded in all previous experiments using longer pulses, allow us to trace the correlated emission of the two electrons on sub-femtosecond timescales. The experimental results, which are discussed in terms of a semiclassical model, provide strong constraints for the development of theories and lead us to revise common assumptions about the mechanism that governs double ionization.
Nature Communications | 2013
E. Wells; C. E. Rallis; M. Zohrabi; R. Siemering; Bethany Jochim; P. R. Andrews; U. Ablikim; B. Gaire; S. De; K. D. Carnes; Boris Bergues; R. de Vivie-Riedle; Matthias F. Kling; Itzik Ben-Itzhak
Shaping ultrafast laser pulses using adaptive feedback can manipulate dynamics in molecular systems, but extracting information from the optimized pulse remains difficult. Experimental time constraints often limit feedback to a single observable, complicating efforts to decipher the underlying mechanisms and parameterize the search process. Here we show, using two strong-field examples, that by rapidly inverting velocity map images of ions to recover the three-dimensional photofragment momentum distribution and incorporating that feedback into the control loop, the specificity of the control objective is markedly increased. First, the complex angular distribution of fragment ions from the nω+C2D4→C2D3++D interaction is manipulated. Second, isomerization of acetylene (nω+C2H2→C2H2(2+)→CH2++C+) is controlled via a barrier-suppression mechanism, a result that is validated by model calculations. Collectively, these experiments comprise a significant advance towards the fundamental goal of actively guiding population to a specified quantum state of a molecule.
Physical Review A | 2012
Adi Natan; Uri Lev; Vaibhav S. Prabhudesai; Barry D. Bruner; D. Strasser; D. Schwalm; Itzik Ben-Itzhak; O. Heber; Yaron Silberberg
We present a method to control photodissociation by manipulating the bond-softening mechanism occurring in strong shaped laser fields, namely by varying the chirp sign and magnitude of an ultrashort laser pulse. Manipulation of bond softening is experimentally demonstrated for strong-field (
Optics Express | 2013
Guillaume Laurent; W. Cao; Itzik Ben-Itzhak; C. L. Cocke
{10}^{12}\char21{}{10}^{13}
Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms | 1992
Itzik Ben-Itzhak; S.G. Ginther; K. D. Carnes
W/cm
Optics Express | 2015
Benjamin Langdon; Jonathan Garlick; Xiaoming Ren; Derrek J. Wilson; Adam M. Summers; Stefan Zigo; Matthias F. Kling; Shuting Lei; Christopher G. Elles; E. Wells; E. D. Poliakoff; K. D. Carnes; Vinod Kumarappan; Itzik Ben-Itzhak; Carlos Trallero-Herrero
{}^{2}
Optics Letters | 2005
Pengqian Wang; A. Max Sayler; K. D. Carnes; B. D. Esry; Itzik Ben-Itzhak
) photodissociation of H
Journal of Physics B | 1996
Itzik Ben-Itzhak; Vidhya Krishnamurthi; K. D. Carnes; H. Aliabadi; H. Knudsen; U. Mikkelsen; B. D. Esry
{}_{2}^{+}
Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms | 1989
Tom J. Gray; Itzik Ben-Itzhak; N.B. Malhi; V. Needham; K. D. Carnes; J.C. Legg
, exhibiting a substantial increase of dissociation by positively chirped pulses with respect to both negatively chirped and transform-limited pulses. The measured kinetic energy release and angular distributions are used to quantify the degree of dissociation control. The control mechanism is attributed to the interplay of dynamic alignment and chirped light induced potential curves.
Review of Scientific Instruments | 2007
B. Gaire; A. M. Sayler; Pengqian Wang; Nora G. Johnson; Matthew J. Leonard; E. Parke; K. D. Carnes; Itzik Ben-Itzhak
In this work we propose a novel procedure for the characterization of attosecond pulses. The method relies on the conversion of the attosecond pulse into electron wave-packets through photoionization of atoms in the presence of a weak IR field. It allows for the unique determination of the spectral phase making up the pulses by accurately taking into account the atomic physics of the photoionization process. The phases are evaluated by optimizing the fit of a perturbation theory calculation to the experimental result. The method has been called iPROOF (improved Phase Retrieval by Omega Oscillation Filtering) as it bears a similarity to the PROOF technique [Chini et al. Opt. Express 18, 13006 (2010)]. The procedure has been demonstrated for the characterization of an attosecond pulse train composed of odd and even harmonics. We observe a large phase shift between consecutive odd and even harmonics. The resulting attosecond pulse train has a complex structure not resembling a single attosecond pulse once per IR period, which is the case for zero phase. Finally, the retrieval procedure can be applied to the characterization of single attosecond pulses as well.