中国物理B：英文版

Semi-classical explanation for the dissociation control of H2＋

贾正茂, 曾志男, Li Ru Xin, 徐至展

Published Jan 1, 2014• 0 citations

Abstract

A semi-classical model is utilized to explain the dissociation control of the hydrogen molecular ion (H_2~+). By analyzing the curve of the dissociation asymmetry parameter as a function of the time delay between the exciting and steering pulses, we find that the dissociation control is dependent not only on the peak intensity and direction of the electric field of the steering pulse, but also on the peak intensity of the exciting pulse.

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中国物理B：英文版

Semi-classical explanation for the dissociation control of H2＋

贾正茂, 曾志男, Li Ru Xin, 徐至展

Published Jan 1, 2014• 0 citations

OpenAlex

Abstract

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Laser Induced Dissociation Control of

H_2^+

and

H_3^{2+}

Laser induced dissociation control of the symmetric diatomic molecular ion

H_2^+

and the triatomic molecular ion

H_3^{2+}

is discussed. The simulation results demonstrate that a long-wavelength terahertz or mid-infrared laser pulse can be used to control the electrons of the dissociative states after the excitation of an ultrashort ultraviolet (UV) laser pulse. For

H_2^+,

there exists an effective time, which increases with increasing pulse duration of the UV laser pulse, for controlling the molecular dissociation. For the electrons of the

1sσ_g

state, they move along the polarization direction of the dissociation control electric field. In contrast, for the electrons of the

2pσ_u

state, they move in the opposite direction to that of the electric force. And for the triatomic molecule

H_3^{2+}

, the electron dissociation control can also be realized by changing the central wavelength of the exciting UV pulse.

Electron localization of

{{\rm{H}}}_{2}^{+}

in a dc electric field

Orthogonally polarized two-color sequential laser pulses are used to control the electron localization in the dissociation of H

{}_{2}{}^{+}

. The first single attosecond pulse, whose polarization axis is perpendicular to the molecular axis, excites H

{}_{2}{}^{+}

from $1s{\ensuremath{\sigma}}_{g}$ to $2p{\ensuremath{\pi}}_{u}$, and the time-delayed infrared pulse, whose polarization axis is parallel to the molecular axis, steers the electron between two nuclei. The simulation of the time-dependent Schr\"odinger equation predicts the control degree of the electron localization can be up to 90

%

with the current laser technology. In this article, we reveal that the mechanism for this asymmetric localization is due to the mixture of $2p{\ensuremath{\pi}}_{g}$ and $2p{\ensuremath{\pi}}_{u}$, instead of $1s{\ensuremath{\sigma}}_{g}$and $2p{\ensuremath{\sigma}}_{u}$ in the previous studies.

The single ionization of

{\mathrm{H}}_{2}

in strong laser fields creates the correlated electron-

{{\mathrm{H}}_{2}}^{+}

pair. Based on such a correlation, we conceive a strategy to control the energy spectra of the freed electron or dissociative fragments by simulating the time-dependent Schr\"odinger equation. Two attosecond pulses in a train produce the replica of electron-

{{\mathrm{H}}_{2}}^{+}

pairs, which are to be steered by a time-delayed phase-stabilized (mid)infrared laser pulse. By controlling the behavior of the freed electron, the dissociation of

{{\mathrm{H}}_{2}}^{+}

can be controlled even though there is no direct laser-

{{\mathrm{H}}_{2}}^{+}

coupling. On the other hand, the photoelectron energy spectra can be manipulated via laser-

{{\mathrm{H}}_{2}}^{+}

coupling. This study demonstrates the entanglement of molecular quantum wave packets, and affords a route to remotely control molecular dissociative ionization.