Enhanced ionization of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">H</mml:mi><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>molecule driven by intense ultrashort laser pulses

Dehghanian, Effat; Bandrauk, André D.; Kamta, G. Lagmago

doi:10.1103/physreva.81.061403

Cited by 56 publications

(49 citation statements)

References 23 publications

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“…Exercising caution, however, is necessary when these separated treatments for the electronic and nuclear degrees of freedom are applied in practice, for example, to nearthreshold photoionization. The fixed-nuclei approximation (FNA), which neglects the coupling of the electronic states with the nuclear motion, has also been widely employed to study electronic ionization, including the interaction with 800 nm infrared pulses [12,13].…”

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confidence: 99%

Multiphoton ionization of H2+in xuv laser pulses

et al. 2011

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We consider the ionization of the hydrogen molecular ion after one-, two-, and three-photon absorption over a large range of photon energies between 9 and 40 eV in the fixed-nuclei approximation. The temporal development of the system is obtained in a fully ab initio time-dependent grid-based approach in prolate spheroidal coordinates. The alignment dependence of the one-photon ionization amplitude is highlighted in the framework of time-dependent perturbation theory. For one-photon ionization as a function of the nuclear separation, the calculations reveal a significant minimum in the ionization probability. The suppressed ionization is attributed to a Cooper-type minimum, which is similar, but not identical, to the cancellation effect observed in photoionization cross sections of some noble-gas atoms. The effect of the nonspherical two-center Coulomb potential is analyzed. For two-and three-photon ionization, the angle-integrated cross sections clearly map out intermediate-state resonance, and the predictions of the current computations agree very well with those from time-independent calculations. The dominant emission modes for two-photon ionization are found to be very similar in both resonance and off-resonance regions.

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confidence: 99%

Multiphoton ionization of H2+in xuv laser pulses

et al. 2011

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“…have been predicted theoretically by solving the full-dimensional Schrödinger equation [8][9][10][11][12][13][14][15][16][17] and observed experimentally [18][19][20][21]. Similar results are available for some other homo- [22][23][24][25] and heteronuclear [26] diatomic molecules. Recently, a related phenomenon of multiple ionization bursts within a half-cycle of the laser field in one-and two-dimensional models of H + 2 for R ∼ 7 a.u.…”

Section: Introductionmentioning

confidence: 65%

“…For the Eckart potential (4), the function δ(k) as well as the coefficients in Eq. (25) can be obtained analytically [3,39]. For the parameters of V 1 (z) we find Figure 6 compares the exact results for δ(k) with the lowenergy approximation (25).…”

Section: Atomic Static-field-induced States In V 1 (Z)mentioning

confidence: 89%

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Static-field-induced states and their manifestation in tunneling ionization dynamics of molecules

et al. 2012

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The physical origin and properties of quasistationary static-field-induced states (SFISs) are discussed. SFISs can be supported by a combination of any atomic or molecular potential and an external static electric field and do not have counterparts in the absence of the field. A resonant tunneling ionization (RTI) mechanism of molecules proceeding via SFISs is analyzed for a one-dimensional model. It is shown that SFISs manifest themselves as peaks of the tunneling ionization rate both in static and time-dependent fields in the adiabatic regime. The peaks are located along the RTI ridges in the plane of internuclear distance R and the momentary value of electric field F . The RTI via SFISs appears to be one of the general ionization mechanisms of molecules.

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“…Recently, most studies have focused on studying molecular orientation-dependent multiphoton ionization, high-order harmonic generation (HHG) [1][2][3][4][5], and control of molecular orientation [6][7][8][9][10]. Unlike rare gas atoms, the rotational interference in a molecular system is more important, then the control of molecular alignment and orientation in selective rotational excitation becomes crucial [11,12]; and various control approaches are proposed [13][14][15].…”

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confidence: 99%

An analytic algebraic approach to study the influence of molecular alignment and orientation on multiphoton excitation in intense laser fields

Feng

Zheng

2011

Molecular Physics

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The influence of molecular alignment and orientation on multiphoton vibrational excitation of diatomic molecules H 2 , HD, and D 2 is studied by an analytical algebraic approach. The explicit expressions of the timeevolution operator and the excitation probability are given. The long-time average absorbed energy spectra and the time-dependent absorbed energy are obtained. Results show that the impact of molecular orientation on the multiphoton resonant excitation is decided by the molecular type and molecular anharmonicity. This is valuable for controlling the vibrational excitation of molecules, which is relevant to the whole field of molecular physics and physical chemistry. Furthermore, good agreement with numerical simulation is achieved.

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Enhanced ionization of theH2molecule driven by intense ultrashort laser pulses

Cited by 56 publications

References 23 publications

Multiphoton ionization of H2+in xuv laser pulses

Multiphoton ionization of H2+in xuv laser pulses

Static-field-induced states and their manifestation in tunneling ionization dynamics of molecules

An analytic algebraic approach to study the influence of molecular alignment and orientation on multiphoton excitation in intense laser fields

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