Theory of strong-field ionization of aligned<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>CO</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>

Abu-samha, Mahmoud; Madsen, Lars Bojer

doi:10.1103/physreva.80.023401

Cited by 71 publications

(83 citation statements)

References 35 publications

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“…Following the approach given in Refs. [19,49], applied successfully to CO 2 and other linear molecules, we have built a single-active-electron potential for OCS.…”

Section: Is [F(t) = −∂ T A(t)]mentioning

confidence: 99%

“…The ability to align molecules, i.e., to confine one or more molecular axes along space-fixed axes, has over the past few years provided a valuable tool to experimentally explore the orientational dependence of strong-field ionization and, consequently, opened up the field for comparing theoretical and experimental results [7,10,11,14,15,19]. The majority of studies have focused on nonpolar linear molecules where nonadiabatic alignment, by a linearly polarized laser pulse, provides a convenient way to prepare a sample of one-dimensionally-aligned molecules [20,21].…”

Section: Introductionmentioning

confidence: 99%

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Ionization of oriented carbonyl sulfide molecules by intense circularly polarized laser pulses

et al. 2011

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We present combined experimental and theoretical results on strong-field ionization of oriented carbonyl sulfide molecules by circularly polarized laser pulses. The obtained molecular frame photoelectron angular distributions show pronounced asymmetries perpendicular to the direction of the molecular electric dipole moment. These findings are explained by a tunneling model invoking the laser-induced Stark shifts associated with the dipoles and polarizabilities of the molecule and its unrelaxed cation. The focus of the present article is to understand the strong-field ionization of one-dimensionally-oriented polar molecules, in particular asymmetries in the emission direction of the photoelectrons. In the following article [Phys. Rev. A 83, 023406 (2011)] the focus is to understand strong-field ionization from three-dimensionally-oriented asymmetric top molecules, in particular the suppression of electron emission in nodal planes of molecular orbitals.

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“…Following the approach given in Refs. [19,49], applied successfully to CO 2 and other linear molecules, we have built a single-active-electron potential for OCS.…”

Section: Is [F(t) = −∂ T A(t)]mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ionization of oriented carbonyl sulfide molecules by intense circularly polarized laser pulses

et al. 2011

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“…In To precisely determine the minimum in the HHG spectra, accurate alignment-dependent ionization probability N (θ) for each molecular orbital is needed. For CO 2 , even for HOMO, different theories in the literature [65,[172][173][174][175][176] (also see Publication [14] and [18]) show non-negligible differences, and they do not agree with the experimental data [172]. Here we examine how the HHG spectra change with the different ionization rates used.…”

Section: Hhg Spectra Of Aligned Comentioning

confidence: 76%

“…It differs significantly from the predictions of MO-ADK and SFA (see Publication [18]). In fact, so far all theoretical attempts [173][174][175][176] (also see Publication [16]) have not been able to confirm the sharp alignment dependence reported in the experiment. Furthermore, the observed HHG spectra from aligned molecules are inconsistent with the reported experimental alignment dependence of ionization [103,118].…”

Section: Introductionmentioning

confidence: 85%

Theory of Nonlinear Propagation of High Harmonics Generated in a Gaseous Medium

Jin

2013

Springer Theses

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In this thesis, we establish the theoretical tools to investigate high-order harmonic generation (HHG) by intense infrared lasers in a gaseous medium. The macroscopic propagation of both the fundamental and the harmonic fields is taken into account by solving Maxwell's wave equations, while the single-atom (or single-molecule) response is obtained by quantitative rescattering theory. The initial spatial mode of the fundamental laser is assumed either a Gaussian or a truncated Bessel beam. On the examples of Ar, N 2 and CO 2 , we demonstrate that the available experimental HHG spectra with isotropic and aligned target media can be accurately reproduced theoretically even though the HHG spectra are sensitive to the experimental conditions. We show that the macroscopic HHG can be expressed as a product of a macroscopic wave packet and a photorecombination cross section, where the former depends on laser and experimental conditions while the latter is the property of the target only. The factorization makes it possible to retrieve the single-atom or single-molecule structure information from experimental HHG spectra. As for the multiple molecular orbital contribution in HHG, it causes the disappearance of the minimum in the HHG spectrum of aligned N 2 with the increase of laser intensity, and the position of minimum in HHG spectrum of aligned CO 2 depending on many factors is also attributed to it, which could explain why the minima observed in different laboratories may differ. For an important application of HHG as ultrashort light source, we show that measured continuous harmonic spectrum of Xe due to the reshaping of the fundamental laser field can be used to produce an isolated attosecond pulse by spectral and spatial filtering in the far field. For on-going application of using HHG to ionize aligned molecules, we present the photoelectron angular distribution from aligned N 2 and CO 2 in the laboratory frame, which can be compared directly with future experiments. demonstrate that the available experimental HHG spectra with isotropic and aligned target media can be accurately reproduced theoretically even though the HHG spectra are sensitive to the experimental conditions. We show that the macroscopic HHG can be expressed as a product of a macroscopic wave packet and a photorecombination cross section, where the former depends on laser and experimental conditions while the latter is the property of the target only. The factorization makes it possible to retrieve the single-atom or single-molecule structure information from experimental HHG spectra. As for the multiple molecular orbital contribution in HHG, it causes the disappearance of the minimum in the HHG spectrum of aligned N 2 with the increase of laser intensity, and the position of minimum in HHG spectrum of aligned CO 2 depending on many factors is also attributed to it, which could explain why the minima observed in different laboratories may differ. For an important application of HHG as ultrashort light source, we show that measured continu...

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“…For example, it opens a route to following attosecond dynamics of holes between ionization and recombination [15][16][17][18]. However, the drawback is the need for accurate theoretical description of strong-field dynamics, starting with strong-field ionization, for both single [20][21][22][23][24][25][26][27][28] and multiple ionization channels [29][30][31]. Quantitative modeling of harmonic generation requires one to consider not only multiple ionization and recombination channels corresponding to different states of the molecular ion, but also their coupling during strong-field ionization and between ionization and recombination [13,15,32].…”

Section: Introductionmentioning

confidence: 99%