Molecular tunneling ionization of the carbonyl sulfide molecule by double-frequency phase-controlled laser fields

Ohmura, Hideki; Saito, Naoaki; Morishita, Tōru

doi:10.1103/physreva.89.013405

Cited by 56 publications

(55 citation statements)

References 43 publications

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“…The applications in laser-induced rescattering photoelectron spectroscopy [23,26] and high-order harmonic spectroscopy [24] require accurate ionization rates. Recently, the OE-WFAT was successfully applied in an analysis of experimental photoelectron spectra of C 2 H 4 [27,28] and OCS [29], and other interesting applications are in progress [30]. The ME-WFAT accounting for manyelectron effects in the tunneling step is highly relevant for strong-field physics.…”

Section: Introductionmentioning

confidence: 99%

Weak-field asymptotic theory of tunneling ionization in many-electron atomic and molecular systems

2014

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The weak-field asymptotic theory of tunneling ionization in an external static uniform electric field [Tolstikhin et al., Phys. Rev. A 84, 053423 (2011)] is extended to many-electron atomic and molecular systems treated in the frozen-nuclei approximation. The leading-order term in the asymptotic expansion of the ionization rate in the value of the field F for F → 0 is obtained. The resulting formulas express in terms of properties of the unperturbed system. The most essential difference from the one-electron case, through which the many-electron character of the present theory reveals itself, is that the structure factor for a given ionization channel, defining the dependence of the ionization rate into this channel on the orientation of the system with respect to the field, is determined by the corresponding Dyson orbital. The theory is illustrated by calculations for several few-electron systems. The asymptotic results are compared with accurate fully correlated calculations of tunneling ionization rates available in the literature.

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Section: Introductionmentioning

confidence: 99%

Weak-field asymptotic theory of tunneling ionization in many-electron atomic and molecular systems

2014

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“…We have reported that the mechanism of the OMS-TI induced by phase-controlled ω + 2ω laser fields can be explained by the geometric structure of the HOMO [26,[29][30][31][32][33]; thus some kind of screening due to multi-electron effects that cancel the Stark shift could be induced. A comprehensive theory involving multielectron effects for any molecule is now in progress, and the experimental results of OSM-TI for C 3 H 5 Cl and C 3 H 5 Br with intermediate conditions will be a benchmark for the developed theory of molecular TI.…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, it was found that molecular TI in OCS induced by LP ω + 2ω laser fields is dominated by the geometric structure of the HOMO, which is different from the results obtained with singlefrequency circularly polarized laser fields [29]. Although molecular TI is an important and fundamental phenomenon in the field of molecular science using intense laser fields, molecular TI is still controversial in that the mechanisms extracted from some experiments have not yet converged.…”

Section: Introductionmentioning

confidence: 83%

Molecular tunnelling ionization of allyl halides induced by phase-controlled two-colour laser fields

Ohmura¹,

Saito²

2014

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

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A single-electron picture based on the multiconfiguration time-dependent Hartree-Fock method: application to the anisotropic ionization and subsequent high-harmonic generation of the CO molecule S Ohmura et al AbstractWe have investigated the molecular tunnelling ionization (TI) of four allyl halide molecules (C 3 H 5 X; X = F, Cl, Br, I) induced by phase-controlled two-colour laser fields consisting of a fundamental light and a second-harmonic light with a pulse duration of 130 fs and an intensity of 10 12 -10 13 W cm −2. The geometric structure of the highest occupied molecular orbital (HOMO) of the four allyl halides can be systematically changed by replacing the halogen atom. We observed phase-dependent orientation-selective molecular ionization in the four methyl halide molecules. The mechanism of molecular TI is discussed in connection with the geometric structure of the HOMO.

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“…This basic theory was applied to the analysis of experimental photoionization spectra in Refs. [20][21][22]. In Ref.…”

Section: Introductionmentioning

confidence: 99%

Application of the weak-field asymptotic theory to tunneling ionization ofH2O

et al. 2014

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The weak-field asymptotic theory of tunneling ionization in a static electric field is applied to H 2 O. The orientation dependence of the ionization rate is studied. The use of polarization-consistent basis sets with up to heptuble-zeta accuracy and variationally optimized exponents improves the asymptotic form of the wave function and allows for an accurate extraction of the structure factor defining the ionization rate. The results are presented based on Hartree-Fock wave functions and density functional theory. The density functional theory reproduces closely the experimental vertical ionization potential. We find that the rate peaks at an angle of 81 • between the field and molecular principal inertial axis through the O atom. The predictions for the orientation dependence of the rate are compared to available theoretical results.

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Molecular tunneling ionization of the carbonyl sulfide molecule by double-frequency phase-controlled laser fields

Cited by 56 publications

References 43 publications

Weak-field asymptotic theory of tunneling ionization in many-electron atomic and molecular systems

Weak-field asymptotic theory of tunneling ionization in many-electron atomic and molecular systems

Molecular tunnelling ionization of allyl halides induced by phase-controlled two-colour laser fields

Application of the weak-field asymptotic theory to tunneling ionization ofH2O

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