Chinese Physics B

Electron localization of ${{\rm{H}}}_{2}^{+}$ in a dc electric field

Zhengmao Jia, Zhinan Zeng, W T Tang, R X Li

Published Jan 1, 2017• 0 citations

Abstract

A dc electric field is utilized to steer the electron motion after the molecular ion H 2 + is excited by an ultrashort ultraviolet laser pulse. The numerical simulation shows that the electron localization distribution and the dissociation control ratio are dependent on the polarization direction and amplitude of the dc electric field. Most electrons of the dissociation state move opposite to the dc electric field and stabilize at the dressed-up potential well, for the dressed-down well is occupied by the electrons of the 1s σ g state.

DOI: 10.1088/1674-1056/26/1/013201

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Chinese Physics B

Electron localization of ${{\rm{H}}}_{2}^{+}$ in a dc electric fieldElectron localization of ${{\rm{H}}}_{2}^{+}$ in a dc electric field

Zhengmao Jia, Zhinan Zeng, W T Tang, R X Li

Published Jan 1, 2017• 0 citations

Publisher

Abstract

DOI: 10.1088/1674-1056/26/1/013201

Related papers

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Within the Born-Oppenheimer approximation, we build a multichannel model to simulate the dissociation of ${\mathrm{H}}_{2}{}^{+}$ in strong laser fields. Two applications of this model are presented: first, orthogonally polarized UV and infrared pulses are used to dissociate ${\mathrm{H}}_{2}{}^{+}$ into $2p{\ensuremath{\pi}}_{u}$ and $3d{\ensuremath{\pi}}_{g}$ states, whose superposition results in asymmetric electron localization after the dissociation; second, two orthogonally polarized UV pulses are introduced to trigger competing Rabi oscillations among $1s{\ensuremath{\sigma}}_{g}$, $2p{\ensuremath{\sigma}}_{u}$, $3d{\ensuremath{\sigma}}_{g}$ and $2p{\ensuremath{\pi}}_{u}$ states. This study shows the dissociation of ${\mathrm{H}}_{2}{}^{+}$ can be steered into selected electronic states with controllable probabilities with state-of-the-art laser technologies.Within the Born-Oppenheimer approximation, we build a multichannel model to simulate the dissociation of ${\mathrm{H}}_{2}{}^{+}$ in strong laser fields. Two applications of this model are presented: first, orthogonally polarized UV and infrared pulses are used to dissociate ${\mathrm{H}}_{2}{}^{+}$ into $2p{\ensuremath{\pi}}_{u}$ and $3d{\ensuremath{\pi}}_{g}$ states, whose superposition results in asymmetric electron localization after the dissociation; second, two orthogonally polarized UV pulses are introduced to trigger competing Rabi oscillations among $1s{\ensuremath{\sigma}}_{g}$, $2p{\ensuremath{\sigma}}_{u}$, $3d{\ensuremath{\sigma}}_{g}$ and $2p{\ensuremath{\pi}}_{u}$ states. This study shows the dissociation of ${\mathrm{H}}_{2}{}^{+}$ can be steered into selected electronic states with controllable probabilities with state-of-the-art laser technologies.

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Electron localization of

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

in a dc electric field

Electron localization of linear symmetric molecular ion

{{\rm{H}}}_{3}^{2+}

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.

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.

Within the Born-Oppenheimer approximation, we build a multichannel model to simulate the dissociation of

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

in strong laser fields. Two applications of this model are presented: first, orthogonally polarized UV and infrared pulses are used to dissociate

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

into $2p{\ensuremath{\pi}}_{u}$ and $3d{\ensuremath{\pi}}_{g}$ states, whose superposition results in asymmetric electron localization after the dissociation; second, two orthogonally polarized UV pulses are introduced to trigger competing Rabi oscillations among $1s{\ensuremath{\sigma}}_{g}$, $2p{\ensuremath{\sigma}}_{u}$, $3d{\ensuremath{\sigma}}_{g}$ and $2p{\ensuremath{\pi}}_{u}$ states. This study shows the dissociation of

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

can be steered into selected electronic states with controllable probabilities with state-of-the-art laser technologies.