Asymmetric spatial distribution in the high-order harmonic generation of a H<sub>2</sub><sup>+</sup>molecule controlled by the combination of a mid-infrared laser pulse and a terahertz field

Zhang, Jun; Pan, Xue-Fei; Xia, Chang-Long; Du, Hang; Xu, Tongtong; Guo, Jing; Liu, Xue‐Shen

doi:10.1088/1612-2011/13/7/075302

Cited by 23 publications

(10 citation statements)

References 37 publications

(43 reference statements)

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“…Taking advantage of the more complex geometry compared with the atomic case, the interaction between a laser and a molecule has also attracted much attention [14][15][16][17][18]. The molecular high harmonic generation using a circularly polarized (CP) laser pulse has been investigated, and the results explained and predicted the polarization characteristics of harmonic spectra by using a bicircular laser field [19].…”

Section: Introductionmentioning

confidence: 99%

Polarization property of high harmonics generated from nitrogen molecule by bichromatic counter-rotating circularly polarized laser fields

Zhang

Zhu

et al. 2019

Laser Phys.

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The polarization property of high harmonics from N 2 molecule is investigated in a bichromatic counter-rotating circularly polarized laser field by solving the two-dimensional time-dependent Schrödinger equation. The left-and right-circularly polarized harmonics are investigated and the results show that the helicity of the harmonic is reversed at particular harmonic orders. We also show that the electron ionized at one lobe of laser field will recombine with two different N nuclei at the same and the following laser lobes, which results in different polarization properties. The spatial distribution of the harmonic degree of circular polarization are presented to illustrate the effect on polarization properties of the electron recombined with different nuclei. The semi-classical analysis and the time-dependent probability density of electron wave packet are also demonstrated which provide a clear picture of the electron recombination process.

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Section: Introductionmentioning

confidence: 99%

Polarization property of high harmonics generated from nitrogen molecule by bichromatic counter-rotating circularly polarized laser fields

Zhang

Zhu

et al. 2019

Laser Phys.

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“…It is well known that the molecular system is more complicated due to the additional degree of freedom in nuclei [29]. For instance, for the present + H 2 , (i) the electron can be ionized through the multi-photon resonance ionization (MPRI) [30,31], the charge-resonance-enhanced-ionization (CREI) [32], and the dissociative ionization [33] and (ii) the MHHG can be produced not only from one H nucleus but also with another H nucleus, thus leading to the asymmetric contributions of the MHHG from the two-H nuclei [34][35][36][37] etc.…”

Section: Introductionmentioning

confidence: 99%

Molecular harmonic generation in bowtie-shaped nanostructure

Hang

Feng

2017

Laser Phys.

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Molecular high-order harmonic generation (MHHG) from + H 2 in the bowtie-shaped nanostructure has been investigated. The results show that (i) due to the surface plasmon polaritons in the bowtie-shaped nanostructure, the laser intensity can be enhanced and present the nonhomogeneous effect in space. As a result, the extension of the harmonic cutoff can be achieved when the position of + H 2 is injected away from the gap center of the nanostructure. However, due to the limited gap size of the nanostructure, the inherent threshold value of the harmonic cutoff can be found. (ii) Due to the asymmetric enhancement of the laser intensity in space, the extended higher harmonics come from E(t) > 0 or E(t) < 0 for the cases of the positive or the negative injected positions of + H 2 , respectively. (iii) In the few-cycle pulse, the extended higher harmonics mainly comes from the multi-photon resonance ionization (MPRI) around R = 4.0 and R = 4.5 but from only one harmonic emission event (HEE), thus leading to the intensity difference of the extended higher harmonics from the positive and the negative positions of + H 2 . In the multi-cycle pulse, the extended higher harmonics are also attributed to the MPRI but from R = 3.5 to R = 6.0 and there are three HEEs contributed to the extended higher harmonics, thus leading to the similar intensity of the extended higher harmonics from the positive and the negative positions of + H 2 . (iv) Due to the slower nuclear motion of the heavy nuclei, the intensities of the harmonics from + T 2 are lower than those from + H 2 . (v) The contributions of the MHHG from the two-H nuclei show that when E(t) > 0 or E(t) < 0, the left-H or the right-H plays the dominating role in the MHHG. Moreover, as + H 2 moves away from the gap center, the intensity difference of the higher harmonics from the two-H nuclei can be enhanced. But, it can be decreased as the pulse duration increases.

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“…[11][12][13] Undoubtedly, the contributions of the two nuclei to the MHHG play an important role in molecular dynamics and become a subject of great concern. For instance, Zhang et al [14,15] theoretically investigated the spatial distribution in H + 2 driven by the THz controlling field. Pei and Miao [16] theoretically investigated the contributions of the two nuclei to the harmonic generation in H + 2 .…”

Section: Introductionmentioning

confidence: 99%

Laser phase effect on asymmetric harmonic distribution in H 2+ *

Feng

Liu

2017

Chinese Phys. B

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The laser phase effect on the spatial distribution of the molecular high-order harmonic generation (MHHG) spectrum from H 2 + is theoretically investigated through solving the Non-Bohn–Oppenheimer (NBO) time-dependent Schrödinger equation (TDSE). The results are shown as follows. (i) The generated harmonics from the two nuclei each present an asymmetric distribution. Particularly, when the laser phases are chosen from 0.0π to 0.6π and from 1.7π to 2.0π, the contribution from the negative-H plays a main role in harmonic generation. When the laser phases are chosen from 0.7π to 1.6π, the contribution from the positive-H to the harmonic generation is remarkably enhanced and becomes greater than that from the negative-H. The electron localization, the time-frequency analyses of the harmonic spectrum and the time-dependent wave function are shown to explain the asymmetric harmonic distribution in H 2 + , which provides us with a method to control the electron motion in molecules. (ii) As the pulse duration increases, the asymmetric distributions of the MHHG in two H nuclei decrease. (iii) Isotope investigation shows that the asymmetric harmonic distribution can be reduced by introducing the heavy nucleus (i.e., D 2 + ) .

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Asymmetric spatial distribution in the high-order harmonic generation of a H₂⁺molecule controlled by the combination of a mid-infrared laser pulse and a terahertz field

Cited by 23 publications

References 37 publications

Polarization property of high harmonics generated from nitrogen molecule by bichromatic counter-rotating circularly polarized laser fields

Polarization property of high harmonics generated from nitrogen molecule by bichromatic counter-rotating circularly polarized laser fields

Molecular harmonic generation in bowtie-shaped nanostructure

Laser phase effect on asymmetric harmonic distribution in H 2+ *

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Asymmetric spatial distribution in the high-order harmonic generation of a H2+molecule controlled by the combination of a mid-infrared laser pulse and a terahertz field

Cited by 23 publications

References 37 publications

Polarization property of high harmonics generated from nitrogen molecule by bichromatic counter-rotating circularly polarized laser fields

Polarization property of high harmonics generated from nitrogen molecule by bichromatic counter-rotating circularly polarized laser fields

Molecular harmonic generation in bowtie-shaped nanostructure

Laser phase effect on asymmetric harmonic distribution in H 2+ *

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Asymmetric spatial distribution in the high-order harmonic generation of a H₂⁺molecule controlled by the combination of a mid-infrared laser pulse and a terahertz field