Effects of nuclear vibration on the ionization process ofH2+in ultrashort intense laser field

Phan, Ngoc-Loan; Truong, Tran-Chau; Nguyen, Ngoc-Ty

doi:10.1088/1742-6596/627/1/012014

Cited by 4 publications

(3 citation statements)

References 13 publications

(22 reference statements)

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“…To interpret in-depth the dependence of even-to-odd ratio on the nuclear-charge ratio Z 1 /Z 2 , we consider the analytical expression of interference factors presented in Eqs. (10) and (11), causing odd and even harmonics [17]. Since the HHG signal is proportional to the transition dipole as described in Subsec.…”

Section: Iii1 Dependence Of Even-to-odd Ratio On Nuclear-charge Ratiomentioning

confidence: 99%

“…In the past, many studies have been focused on atoms [2,6,7], and then expanded to symmetric molecules [3,4,[8][9][10][11][12], whose HHG spectra contain only odd harmonics due to the timespatial symmetry of the laser-atom/molecule system [13,14]. Recently, much attention has been paid to asymmetric molecules such as HeH 2+ , CO, OCS, HCl [15][16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Molecular Charge Asymmetry on Even-to-odd Ratio of High-order Harmonic Generation

Nguyen-Huynh¹,

Le²,

Phan³

et al. 2020

Comm. in Phys.

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Recently, asymmetric molecules, such as HeH\(_2^+\), CO, OCS, HCl, have been evolved much attention since its rich information in the high-order harmonic generation (HHG), whose ratio of adjacent even and odd harmonics characterizes the asymmetry of molecules. In this paper, we study the dependence of even-to-odd ratio on the asymmetric parameters, in particular, the nuclear-charge ratio, and the permanent dipole, by exploiting a simple but general model of asymmetric molecules \(Z_1Z_2\) subjected to an intense laser pulse. The HHG is simulated by the numerical method of solving the time-dependent Schrödinger equation. We find out that this even-to-odd ratio strongly depends on the nuclear-charge ratio. In particular, the even-to-odd ratio reaches its maximum when the nuclear-charge ratio is about from 0.5 to 0.7. Besides, the dependence on the permanent dipole of the even-to-odd ratio has a non-trivial law. To explain, we calculate the analytical ratio of the transition dipole according to the emission of even and odd harmonics, and this ratio is well consistent with the even-to-odd ratio of the HHG.

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Section: Iii1 Dependence Of Even-to-odd Ratio On Nuclear-charge Ratiomentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Molecular Charge Asymmetry on Even-to-odd Ratio of High-order Harmonic Generation

Nguyen-Huynh¹,

Le²,

Phan³

et al. 2020

Comm. in Phys.

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“…Using the similar 1D model in the non-Born-Oppenheimer (NBO) approach, Nguyen et al . 23 found that the ionization probability initially increases and subsequently decreases as the vibrational level of H 2 + increases.…”

mentioning

confidence: 99%

Dissociation and Ionization of Quasi-Periodically Vibrating H2+ in Intense Few-Cycle Mid-Infrared Laser Fields

Jiang

Yuan

et al. 2017

Sci Rep

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Using quantum mechanics calculations, we theoretically study the dissociation and ionization dynamics of the hydrogen-molecule ion in strong laser fields. Having prepared the nuclear wave packet of H2+ in a specific vibrational state, a pump laser is used to produce a vibrational excitation, leading to quasi-periodical vibration without ionization. Then, a time-delayed few-cycle laser is applied to trigger the dissociation or ionization of H2+. Both the time delay and the intensity of the probe laser alter the competition between dissociation and ionization. We also explore the dependence of kinetic-energy release spectra of fragments on the time delay, showing that the channels of above-threshold dissociation and below-threshold dissociation are opened and closed periodically. Also, dissociation from different channels is influenced by nuclear motion. The dissociation mechanism has been described in detail using the Floquet picture. This work provides a useful method for steering the electronic and nuclear dynamics of diatomic molecules in intense laser fields.

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Probing H2+ nuclear vibration using high-order harmonic generation beyond two-level model

Nguyen¹,

Le²,

Phan³

2016

Computational and Theoretical Chemistry

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Effects of nuclear vibration on the ionization process ofH₂⁺in ultrashort intense laser field

Cited by 4 publications

References 13 publications

Effect of Molecular Charge Asymmetry on Even-to-odd Ratio of High-order Harmonic Generation

Effect of Molecular Charge Asymmetry on Even-to-odd Ratio of High-order Harmonic Generation

Dissociation and Ionization of Quasi-Periodically Vibrating H2+ in Intense Few-Cycle Mid-Infrared Laser Fields

Probing H2+ nuclear vibration using high-order harmonic generation beyond two-level model

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