Influence factor analysis of field-free molecular orientation

Liu, Jingsong; Cheng, Qiuming; Yue, Da-Guang; Zhou, Xianming; Meng, Qingtian

doi:10.1088/1674-1056/27/3/033301

Cited by 6 publications

(4 citation statements)

References 47 publications

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“…Mizuse et al 20 reported high-precision time-resolved Coulomb explosion imaging of the rotational wave packets induced by a polarization-skewed double-pulse to investigate the creation process and dynamics of the packets in N molecules. Liu et al 21 investigated effects of the characteristics of molecules and external fields on field-free molecular orientation, through the comparison of HBr with LiH driven by the combination of a two-color laser pulse and a time-delayed THz laser pulse.…”

Section: Introductionmentioning

confidence: 99%

Achieving high molecular alignment and orientation for CH$$_3$$F through manipulation of rotational states with varying optical and THz laser pulse parameters

Chordiya

Simkó

Szidarovszky

et al. 2022

Sci Rep

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Increasing interest in the fields of high-harmonics generation, laser-induced chemical reactions, and molecular imaging of gaseous targets demands high molecular “alignment” and “orientation” (A&O). In this work, we examine the critical role of different pulse parameters on the field-free A&O dynamics of the CH$$_3$$ 3 F molecule, and identify experimentally feasible optical and THz range laser parameters that ensure maximal A&O for such molecules. Herein, apart from rotational temperature, we investigate effects of varying pulse parameters such as, pulse duration, intensity, frequency, and carrier envelop phase (CEP). By analyzing the interplay between laser pulse parameters and the resulting rotational population distribution, the origin of specific A&O dynamics was addressed. We could identify two qualitatively different A&O behaviors and revealed their connection with the pulse parameters and the population of excited rotational states. We report here the highest alignment of $$\langle {\mathrm{cos}^2\theta }\rangle = 0.843$$ ⟨ cos 2 θ ⟩ = 0.843 and orientation of $$\langle {\mathrm{cos}(\theta )}\rangle = 0.886$$ ⟨ cos ( θ ) ⟩ = 0.886 for CH$$_3$$ 3 F molecule at 2 K using a single pulse. Our study should be useful to understand different aspects of laser-induced unidirectional rotation in heteronuclear molecules, and in understanding routes to tune/enhance A&O in laboratory conditions for advanced applications.

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Section: Introductionmentioning

confidence: 99%

Achieving high molecular alignment and orientation for CH$$_3$$F through manipulation of rotational states with varying optical and THz laser pulse parameters

Chordiya

Simkó

Szidarovszky

et al. 2022

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Kenta Mizuse et al 19 reported high-precision time-resolved Coulomb explosion imaging of the rotational wave packets induced by a polarization-skewed double-pulse to investigate the creation process and dynamics of the packets in N 2 molecules. Jing-Song Liu et al 20 investigated effects of the characteristics of molecules and external fields on field-free molecular orientation, through the comparison of HBr with LiH driven by the combination of a two-color laser pulse and a time-delayed THz laser pulse.…”

Section: Introductionmentioning

confidence: 99%

Manipulation of Rotational States With Varying Pulse Parameter: Achieving High Molecular Alignment and Orientation for CH3F

Chordiya

Simkó

Szidarovszky

et al. 2022

Preprint

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Increasing interest in the fields of high-harmonics generation, laser-induced chemical reactions, and molecular imaging of gaseous targets demands high molecular alignment and orientation (AnO). In this work, we examine the critical role of different pulse parameters on the field-free AnO dynamics of the CH3F molecule, and identify experimentally feasible optical and THz range laser parameters that ensure maximal AnO for such molecules. Herein, apart from rotational temperature, we investigate effects of varying pulse parameters such as, pulse duration, intensity, frequency, and carrier envelop phase (CEP). By analyzing the interplay between laser pulse parameters and the resulting rotational population distributions, the origin of specific AnO dynamics was addressed. We could identify two qualitatively different AnO behaviors and revealed their connection with the pulse parameters and the population of excited rotational states. We report here the highest alignment of ⟨cos2θ⟩=0.843 andorientation of⟨cos(θ)⟩=0.886 for CH3F molecule at 2K using single pulse. Our study should be useful to understand different aspects of laser-induced unidirectional rotation in heteronuclear molecules, and in understanding routes to tune/enhance AnO in laboratory conditions for advanced applications.

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“…[30] To further improve the molecular orientation degree, the shaped pulse followed by a THz laser pulse was designed to achieve a multi-step rotational excitation, and the result obtained became much better than that by the shaped pulse or THz laser pulse alone. [31][32][33] Compared with SCP and HCP, a THz FCP has more optical cycles included in a pulse duration at the same center frequency, and it is relatively easy to generate resonance excitation and create a higher result of molecular alignment. [30] However, most of the studies using various THz pulses to steer the direction of the molecule have still concentrated on the molecular orientation over the years, and the scheme of molecular alignment induced by a THz FCP has seldom been proposed in detail by this time.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of molecular alignment steered by a few-cycle terahertz laser pulse

Cheng

Song

et al. 2022

Chinese Phys. B

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In this paper, the field-free alignment of molecule ClCN is investigated with a terahertz few-cycle pulse (THz FCP) based on the time-dependent density matrix theory. It is shown that a high degree of molecular alignment can be obtained by changing the matching number of the THz FCP in both adiabatic and non-adiabatic regimes. The matching number can affect both the maximum value of the alignment and the time at which it is achieved. It is also found that a higher degree of alignment by the THz FCP can be achieved at lower intensity and there exists the optimization threshold of molecular alignment with the increasing of the field amplitude. Also found is the frequency sensitive region in which the degree of maximum alignment can greatly be enhanced through the modulation of the center frequencies of different THz FCPs. The investigation demonstrates that comparing with a THz single-cycle pulse, a better result of the field-free alignment can be created by a THz FCP at the constant rotational temperature of molecule.

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Influence factor analysis of field-free molecular orientation

Cited by 6 publications

References 47 publications

Achieving high molecular alignment and orientation for CH$$_3$$F through manipulation of rotational states with varying optical and THz laser pulse parameters

Achieving high molecular alignment and orientation for CH$$_3$$F through manipulation of rotational states with varying optical and THz laser pulse parameters

Manipulation of Rotational States With Varying Pulse Parameter: Achieving High Molecular Alignment and Orientation for CH3F

Dynamics of molecular alignment steered by a few-cycle terahertz laser pulse

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