Rotational dynamics of a molecular ensemble in the presence of a strong laser field

Molodenskiy, M. S.; Тихонова, О. В.

doi:10.1134/s1054660x07040159

Cited by 12 publications

(4 citation statements)

References 16 publications

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“…As is well-known, the characteristics of most chemical reactions (like the reaction rate, reaction channel, reaction product, and more) depend on the reactant molecular alignment [1,2] and orientation [3,4]. Nowadays, molecular alignment and orientation play an important role in the field of molecular reaction dynamics [5,6].…”

Section: Introductionmentioning

confidence: 99%

Field-free orientation of LiH molecule induced by two-color femtosecond and terahertz laser pulses

Wang

Zhan

et al. 2019

Laser Phys.

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We theoretically study the field-free molecular orientation by the combination of a two-color femtosecond laser pulse and a time-delayed terahertz (THz) laser pulse, with LiH as the prototype molecule. It is shown that the molecular hyperpolarizability is a vital parameter in achieving molecular orientation according to the pre-excitation created by an intense twocolor femtosecond laser pulse. The relative amplitude of the two-color femtosecond pulse is discussed. In addition, the center frequency of the THz laser pulse is chosen on the basis of the pre-excited population distributions. The carrier-envelope phase of the THz laser pulse as well as the delay time between the femtosecond laser pulse and THz laser pulse are adjusted to achieve a high orientation degree. In addition, the effect of temperature on molecular orientation is also discussed. Finally, according to the population distributions at room temperature, the parameters of the THz laser pulse are re-optimized, and the achieved maximal orientation degree is 0.221 at 300 K.

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Section: Introductionmentioning

confidence: 99%

Field-free orientation of LiH molecule induced by two-color femtosecond and terahertz laser pulses

Wang

Zhan

et al. 2019

Laser Phys.

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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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Rotational dynamics of a molecular ensemble in the presence of a strong laser field

Cited by 12 publications

References 16 publications

Field-free orientation of LiH molecule induced by two-color femtosecond and terahertz laser pulses

Field-free orientation of LiH molecule induced by two-color femtosecond and terahertz laser pulses

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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