Numerical Simulations of femtosecond-laser-induced dynamic alignment of molecules in the high-frequency off-resonance regime

Chen, J.; Xiao-mei, Cui; Zhuo, Shuangmu; Huang, Baoquan; Jiang, Xingshan

doi:10.1134/s1054660x06120139

Cited by 6 publications

(4 citation statements)

References 28 publications

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“…θ , related to the components of second-hyperpolarizability tensor ijkl γ (these higher-order perturbations are apparently more important in the case of asymmetric molecules where first hyperpolarizability ikl β is engaged). [28][29][30][31][32][33] However, when the laser electric field becomes so strong that 0 ~E μ Δ  , the perturbation series for the electronic response does not converge any more, and thus incorporating higherorder perturbations in…”

Section:  | |mentioning

confidence: 99%

Strong-field molecular alignment mediated by nonadiabatic charge localization

Romanov¹,

Levis²

2019

Phys. Rev. A

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A new mode of effective interaction of molecular rotational degrees of freedom with an intense, nonresonant, ultrashort laser pulse is explored. Transient nonadiabatic charge redistribution (TNCR) in larger molecules or molecular ions causes impulsive-torque interaction that replaces the traditional mechanism of molecular alignment based on perturbative interaction of the laser field with electronic subsystem as manifested in linear anisotropic polarizability or hyperpolarizability. We explore this new alignment mechanism on a popular generic model of a tight-binding diatomic molecule. We consider the case of rotational wavepacket formation when a molecule is initially in the ground rotational state. The rotational wavepacket emerging from the TNCR interaction consists of states with higher rotational quantum numbers, in comparison with the anisotropic-polarizability case, and the after-pulse alignment oscillations are out-ofphase with those resulting from the traditional interaction. The TNCR interaction mode is expected to play a major role when a strong laser field actually causes extensive nonresonant excitation and/or ionization of a molecule.

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Section:  | |mentioning

confidence: 99%

Strong-field molecular alignment mediated by nonadiabatic charge localization

Romanov¹,

Levis²

2019

Phys. Rev. A

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“…Molecular orientation [1,2] and alignment [3][4][5] have attracted interests of both physicists and chemists because of their widespread applications in high-order harmonic generation [6], photoelectron angular distribution [7,8], spectral manipulation [9,10], chemical reaction dynamics [11][12][13], photodissociation and photoionization [14,15], the control of femtosecond pulse propagation [16][17][18][19] and attosecond science [20]. Orientation, for polar molecules, has a specific head-versus-tail order, which requires that the molecular rotational wave function lies in the coherent superposition of even J (even parity) and odd J (odd parity) states, whereas alignment, for both nonpolar and polar molecules, refers to the confinement of molecular axes directing to a fixed direction.…”

Section: Introductionmentioning

confidence: 99%

Field-free molecular orientation by two-color femtosecond laser pulse and time-delayed THz laser pulse

Dang¹,

Zhan²,

Han³

et al. 2015

Laser Phys.

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“…Molecular orientation and alignment have attracted the attention of many researchers because of their extensive applications in chemical reaction dynamics [1][2][3][4], highharmonic generation [5][6][7][8], strong-field ionization [9] and photoelectron angular distribution [10,11]. The molecular alignment has been realized by using femtosecond laser pulses [12][13][14][15][16], and can be used to control the THz emission from a two-color filament in air [17]. However, compared with the molecular alignment, the molecular orientation with distinguishable head versus tail orders is much more challenging to realize.…”

Section: Introductionmentioning

confidence: 99%

Field-free molecular orientation by two-color shaped laser pulse together with time-delayed THz laser pulse

Liu¹,

Li²,

Yu³

et al. 2013

Laser Phys. Lett.

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We theoretically investigate field-free molecular orientation by using an off-resonant two-color shaped laser pulse with a slow turn-on and rapid turn-off and a time-delayed THz laser pulse. It is shown that the molecular orientation can be greatly enhanced by applying this scheme compared to the two-color shaped or THz laser pulse alone. We discuss the effects of the rise time and the electric field amplitude of the two-color shaped laser pulse on molecular orientation, and demonstrate that effective molecular orientation can be achieved by a moderate intensity laser pulse with a short rise time. Furthermore, by changing the delay time between the two-color shaped laser pulse and the THz laser pulse and the carrier envelope phase of the THz laser pulse, the molecular orientation can be enhanced or lowered to some degree.

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Numerical Simulations of femtosecond-laser-induced dynamic alignment of molecules in the high-frequency off-resonance regime

Cited by 6 publications

References 28 publications

Strong-field molecular alignment mediated by nonadiabatic charge localization

Strong-field molecular alignment mediated by nonadiabatic charge localization

Field-free molecular orientation by two-color femtosecond laser pulse and time-delayed THz laser pulse

Field-free molecular orientation by two-color shaped laser pulse together with time-delayed THz laser pulse

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