Retrieval of interatomic separations of molecules from laser-induced high-order harmonic spectra

Le, Van-Hoang; Nguyen, Ngoc-Ty; Jin, Cheng; Le, Anh-Thu; Lin, C. D.

doi:10.1088/0953-4075/41/8/085603

Cited by 23 publications

(10 citation statements)

References 21 publications

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“…On the other hand, our distribution is substantially narrower than those produced in other calculations including the strong-field approximation [45] and the TDSE method [22,23]. In particular, as in the case of O 2 , our ionization rate goes to 0 at θ F = 0 and 90…”

Section: B Angular Dependencecontrasting

confidence: 63%

“…12 we present the angular distribution for the CO 2 molecule. In comparison with experiment, our calculation suffers from the same drawback as others [22,23,37,45]: the calculated angular distribution is too broad. Moreover, although the peak angle increases with intensity, it is too low compared to the experimental value: at I = 1.1 × 10 14 W/cm 2 the calculated distribution peaks at θ F = 28…”

Section: B Angular Dependencementioning

confidence: 75%

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Semiclassical complex-time method for tunneling ionization: Molecular suppression and orientational dependence

Gallup

Fabrikant

2010

Phys. Rev. A

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We apply a previously developed semiclassical complex time method to the calculation of tunneling ionization of several diatomic molecules and CO 2 . We investigate the presence or absence of the molecular suppression effect by calculating ionization rates of N 2 versus Ar, O 2 versus Xe, F 2 versus Ar, and CO versus Kr. Comparisons with other theories, including the molecular-orbital-Ammosov-Delone-Krainov (MO-ADK) model and the strong-field approximation, are given. We also analyze the dependence of the ionization rate on the angle θ F between the molecular axis and the field direction. The theoretical results agree quite well with experiment for N 2 and O 2 but give too low a value of the peak angle θ F for CO 2 . Our calculations give small values of the ionization rates for O 2 and CO 2 at θ F = 0 and 90• , in agreement with experiment. Other calculations, including the MO-ADK model and methods involving a numerical integration of the time-dependent Schrödinger equation, exhibit substantially weaker suppression at these angles.

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Section: B Angular Dependencecontrasting

confidence: 63%

Section: B Angular Dependencementioning

confidence: 75%

Semiclassical complex-time method for tunneling ionization: Molecular suppression and orientational dependence

Gallup

Fabrikant

2010

Phys. Rev. A

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“…For N 2 and O 2 , the total ionization rates from the MO-ADK and the (renormalized) MO-SFA agree very well [70]. However for CO 2 the alignment dependent rates from the MO-ADK, the MO-SFA, and the recent experiment [71] all disagree with each other, with the MO-ADK predicting a peak near 30…”

Section: E Description Of Strong-field Ionization From the Mo-adk Anmentioning

confidence: 83%

Quantitative rescattering theory for high-order harmonic generation from molecules

et al. 2009

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The Quantitative Rescattering Theory (QRS) for high-order harmonic generation (HHG) by intense laser pulses is presented. According to the QRS, HHG spectra can be expressed as a product of a returning electron wave packet and the photo-recombination differential cross section of the laser-free continuum electron back to the initial bound state. We show that the shape of the returning electron wave packet is determined mostly by the laser only. The returning electron wave packets can be obtained from the strong-field approximation or from the solution of the time-

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“…Producing HHG spectrum with the longer wave lengths can improve the results due to significant increase of the cutoff energy and, consequently, higher resolution of the FT. The internuclear distances and symmetry of the HOMO can be extracted with good accuracy, which was shown with the examples of N 2 , O 2 and CO 2 [128,129].…”

Section: Molecular Tomography With High Harmonic Generationmentioning

confidence: 60%

Multidimensional high harmonic spectroscopy

Serbinenko

Smirnova

2013

2013 Conference on Lasers &Amp; Electro-Optics Europe &Amp; International Quantum Electronics Conference CLEO EUROPE/IQEC

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Multidimensional high harmonic spectroscopy is a cutting-edge technique for studying the effect of the intense low-frequency laser fields on atoms and molecules. The high energy photons, emitted by a particle as a result of the interaction with the strong laser field, carry the information about the processes in atoms and molecules, which lead to the emission. Multidimensional character of the technique allows to extract parameters of the molecular and atomic ionization dynamics, that were inaccessible before in the same experiment, such as sub-cycle ionization rates, ionization and recombination times.The Thesis presents in detail theoretical analysis of the multidimensional high harmonic generation process within semi-classical approach. Several generating field configurations are considered. The developed theoretical apparatus is then applied to describe multidimensional high harmonic spectroscopy experiments in helium. Initial analysis of the applicability of the technique for the study of multielectron dynamics in carbon dioxide is also performed.The problems, solutions to which are presented in the Thesis, are:• theoretical description of high harmonic generation in multicolor fields• analysis of the gating techniques for the extraction of the parameters of electron trajectories in high harmonic generation in He• proposition of an alternative reconstruction procedure of electron trajectory parameters, that allows one to access to all of them simultaneouslyThe main results of our work are:• Based on theoretical analysis of multidimensional high harmonic generation, we showed, that optimization of the two-dimensional harmonic 3 signal is achieved at each step of the process: ionization, propagation, dynamics in the ion and recombination• We demonstrated, that multidimensional high harmonic spectroscopy is a very sensitive tool allowing one to extract parameters of electron trajectories, such as complex ionization time and complex electron momentum, from the observed harmonic signal• We developed and applied theory to the analysis of two-color high harmonic generation experiments of He atom• We performed initial analysis of two-color HHG experiments in carbon dioxide, which was necessary for further investigation and reconstruction I thank Bettina Becker, the most helpful person in the institute or in the whole world, who made the bureaucratic problems very easy. There was no question she didn't answer and no problem she didn't solve quickly and efficiently.

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Retrieval of interatomic separations of molecules from laser-induced high-order harmonic spectra

Cited by 23 publications

References 21 publications

Semiclassical complex-time method for tunneling ionization: Molecular suppression and orientational dependence

Semiclassical complex-time method for tunneling ionization: Molecular suppression and orientational dependence

Quantitative rescattering theory for high-order harmonic generation from molecules

Multidimensional high harmonic spectroscopy

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