Probing nuclear dynamics of oriented 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mrow><mml:mi>HeH</mml:mi></mml:mrow><mml:mo>+</mml:mo></mml:msup></mml:math>
 with odd-even high-order harmonics

Li, W. Y.; Yu, Shujuan; Wang, S.; Chen, Y. J.

doi:10.1103/physreva.94.053407

Cited by 39 publications

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“…The correspondingly reduced stretching dynamics at 400 nm (cf. [13] for calculations in the context of high-harmonic generation at 600 nm) results in slightly larger KER at low intensities. This is shown in panel (e), which compares KER spectra for both wavelengths at 10 15 W/cm 2 .…”

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confidence: 98%

“…On the theory side, the solution of the time-dependent Schrödinger equation (TDSE) with all 9 degrees of freedom necessary to describe HeH + is extremely challenging and unfeasible with current computational resources. Therefore, approximations such as TDSE calculations with reduced dimensionality [12][13][14] or semiclassical approaches [15] are often used.…”

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confidence: 99%

“…The focus of this work is naturally on the question of how does a strong charge asymmetry and the resulting permanent dipole, like that found in HeH + , affect ionization dynamics in strong laser fields? The large permanent dipole moment allows direct transfer of population from lower to higher vibrational states, which results in stretching of the molecule on the femtosecond timescale [13]. Electronic excitation, on the other hand, is negligible [20] due to the large energy difference between the electronic ground state X 1 Σ + and the first excited state A 1 Σ + , see Fig.…”

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confidence: 99%

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Heteronuclear Limit of Strong-Field Ionization: Fragmentation of HeH+ by Intense Ultrashort Laser Pulses

et al. 2018

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The laser-induced fragmentation dynamics of this most fundamental polar molecule HeH^{+} are measured using an ion beam of helium hydride and an isotopologue at various wavelengths and intensities. In contrast to the prevailing interpretation of strong-field fragmentation, in which stretching of the molecule results primarily from laser-induced electronic excitation, experiment and theory for nonionizing dissociation, single ionization, and double ionization both show that the direct vibrational excitation plays the decisive role here. We are able to reconstruct fragmentation pathways and determine the times at which each ionization step occurs as well as the bond length evolution before the electron removal. The dynamics of this extremely asymmetric molecule contrast the well-known symmetric systems leading to a more general picture of strong-field molecular dynamics and facilitating interpolation to systems between the two extreme cases.

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Heteronuclear Limit of Strong-Field Ionization: Fragmentation of HeH+ by Intense Ultrashort Laser Pulses

et al. 2018

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“…通过将奇次和偶次谐波分开独立研究, 近期的理论工作 [35] 指出, 奇偶谐波辐射在频域上具有显著不同的特性. 通过建立奇偶谐波辐射理论模型, 进一步的理论研究 [35,36] 表明, 奇偶 [36] 、探测不对称分子瞬时结构 [38,39] 、追踪电子动力学 [40] 、探测核的动力学 [41] 、标定取向度 [42] 、探测多中心分子结构 [43] 和探测同位素效应 [44] 等.…”

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Advances on odd-even high-harmonic spectroscopy

Che¹,

Chen²

2020

Chin. Sci. Bull.

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“…This approach is implementable for simulating systems with a limited number of particles in a limited region of momentum or coordinate space. There are different TDSE approaches for simulating the electron dynamics in an atomic or molecular laser-induced system in one, two, or three (full) coordinate (or momentum) dimensions [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. Some of the TDSE approaches treat the nuclei in the laser-induced system dynamically using classical or quantum mechanics.…”

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Static Coherent States Method: One- and Two-Electron Laser-Induced Systems with Classical Nuclear Dynamics

2018

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Featured Application: We present a new computational method that can be used to investigate the quantum dynamics of one-or two-electron systems during interaction with an ultrashort laser pulse, including nuclear dynamics. The inclusion of both electronic and nuclear degrees of freedom allows for a description of a wide range of processes, including charge migration during the nuclear dissociation process. Abstract:In this report, we introduce the static coherent states (SCS) method for investigating quantum electron dynamics in a one-or two-electron laser-induced system. The SCS method solves the time-dependent Schrödinger equation (TDSE) both in imaginary and real times on the basis of a static grid of coherent states (CSs). Moreover, we consider classical dynamics for the nuclei by solving their Newtonian equations of motion. By implementing classical nuclear dynamics, we compute the electronic-state potential energy curves of H + 2 in the absence and presence of an ultra-short intense laser field. We used this method to investigate charge migration in H + 2 . In particular, we found that the charge migration time increased exponentially with inter-nuclear distance. We also observed substantial charge localization for sufficiently long molecular bonds.

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Probing nuclear dynamics of oriented HeH+ with odd-even high-order harmonics

Cited by 39 publications

References 51 publications

Heteronuclear Limit of Strong-Field Ionization: Fragmentation of HeH+ by Intense Ultrashort Laser Pulses

Heteronuclear Limit of Strong-Field Ionization: Fragmentation of HeH+ by Intense Ultrashort Laser Pulses

Advances on odd-even high-harmonic spectroscopy

Static Coherent States Method: One- and Two-Electron Laser-Induced Systems with Classical Nuclear Dynamics

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