16 results on '"Wenbin, Zhang"'
Search Results
2. Clocking Dissociative Above-Threshold Double Ionization of H2 in a Multicycle Laser Pulse
- Author
-
Shengzhe Pan, Wenbin Zhang, Weihua Zhang, Jihong Tong, Wenyu Jiang, Junjie Qiang, Qinying Ji, Lianrong Zhou, Xiaochun Gong, Fenghao Sun, Chenxu Lu, Peifen Lu, Hui Li, Jian Wu, Hanxiao Li, and Fei Chen
- Subjects
Physics ,Double ionization ,General Physics and Astronomy ,Electron ,Kinetic energy ,Laser ,01 natural sciences ,law.invention ,law ,0103 physical sciences ,Femtosecond ,Physics::Atomic and Molecular Clusters ,Molecule ,Atomic physics ,010306 general physics ,Ultrashort pulse ,Energy (signal processing) - Abstract
The dissociative above-threshold double ionization (ATDI) of ${\mathrm{H}}_{2}$ in strong laser fields involves the sequential releasing of two electrons at specific instants with the stretching of the molecular bond. By mapping the releasing instants of two electrons to their emission directions in a multicycle polarization-skewed femtosecond laser pulse, we experimentally clock the dissociative ATDI of ${\mathrm{H}}_{2}$ via distinct photon-number-resolved pathways, which are distinguished in the kinetic energy release spectrum of two protons measured in coincidence. The timings of the experimentally resolved dissociative ATDI pathways are in good accordance with the classical predictions. Our results verify the multiphoton scenario of the dissociative ATDI of ${\mathrm{H}}_{2}$ in both time and energy fashion, strengthening the understanding of the strong-field phenomenon and providing a robust tool with a subcycle time resolution to clock abundant ultrafast dynamics of molecules.
- Published
- 2021
- Full Text
- View/download PDF
3. Transient Valence Charge Localization in Strong-Field Dissociative Ionization of HCl Molecules
- Author
-
Feng He, Hongcheng Ni, Jin Wen, Liang Xu, Wenbin Zhang, Olivier Faucher, Chenxu Lu, Jian Wu, Peifen Lu, and Junyang Ma
- Subjects
Physics ,Valence (chemistry) ,Atoms in molecules ,General Physics and Astronomy ,Ionic bonding ,Charge (physics) ,02 engineering and technology ,Electron ,021001 nanoscience & nanotechnology ,Laser ,01 natural sciences ,law.invention ,law ,Ionization ,0103 physical sciences ,Physics::Atomic and Molecular Clusters ,Physics::Chemical Physics ,Atomic physics ,010306 general physics ,0210 nano-technology ,Valence electron - Abstract
Probing transient charge localization in the innershell orbital of atoms and molecules has been made possible by the recent progress of advanced light sources. Here, we demonstrate that the ultrafast electron tunneling ionization by an intense femtosecond laser pulse could induce an asymmetric transient charge localization in the valence shell of the HCl molecule during the dissociative ionization process. The transient charge localization is encoded in the laser impulse acquired by the outgoing ionic fragments, and the asymmetry is revealed by carefully examining the electron tunneling-site distinguished momentum angular distribution of the ejected ${\mathrm{H}}^{+}$ fragments. Our work proposes a way to visualize the transient valence charge motion and will stimulate further investigations of the tunneling-site-sensitive ultrafast dynamics of molecules in strong laser fields.
- Published
- 2020
4. Clocking Dissociative Above-Threshold Double Ionization of H_{2} in a Multicycle Laser Pulse
- Author
-
Shengzhe, Pan, Wenbin, Zhang, Hui, Li, Chenxu, Lu, Weihua, Zhang, Qinying, Ji, Hanxiao, Li, Fenghao, Sun, Junjie, Qiang, Fei, Chen, Jihong, Tong, Lianrong, Zhou, Wenyu, Jiang, Xiaochun, Gong, Peifen, Lu, and Jian, Wu
- Abstract
The dissociative above-threshold double ionization (ATDI) of H_{2} in strong laser fields involves the sequential releasing of two electrons at specific instants with the stretching of the molecular bond. By mapping the releasing instants of two electrons to their emission directions in a multicycle polarization-skewed femtosecond laser pulse, we experimentally clock the dissociative ATDI of H_{2} via distinct photon-number-resolved pathways, which are distinguished in the kinetic energy release spectrum of two protons measured in coincidence. The timings of the experimentally resolved dissociative ATDI pathways are in good accordance with the classical predictions. Our results verify the multiphoton scenario of the dissociative ATDI of H_{2} in both time and energy fashion, strengthening the understanding of the strong-field phenomenon and providing a robust tool with a subcycle time resolution to clock abundant ultrafast dynamics of molecules.
- Published
- 2020
5. Timing Dissociative Ionization of H2 Using a Polarization-Skewed Femtosecond Laser Pulse
- Author
-
Qinying Ji, Wenbin Zhang, Shengzhe Pan, Hui Li, Feng He, Xiaochun Gong, Junyang Ma, Ya Bai, Junping Wang, Ruxin Li, Jian Wu, Peng Liu, Chun-Gang Duan, Peifen Lu, Pei-Lun He, Kang Lin, and Hanxiao Li
- Subjects
Physics ,Physics::Optics ,General Physics and Astronomy ,Time resolution ,Laser ,01 natural sciences ,Coincidence ,Dissociation (chemistry) ,law.invention ,law ,Ionization ,0103 physical sciences ,Femtosecond ,Physics::Atomic and Molecular Clusters ,Molecule ,Physics::Atomic Physics ,Atomic physics ,010306 general physics ,Ultrashort pulse - Abstract
We experimentally observe the bond stretching time of one-photon and net-two-photon dissociation pathways of singly ionized ${\mathrm{H}}_{2}$ molecules driven by a polarization-skewed femtosecond laser pulse. By measuring the angular distributions of the ejected photoelectron and nuclear fragments in coincidence, the cycle-changing polarization of the laser field enables us to clock the photon-ionization starting time and photon-dissociation stopping time, analogous to a stopwatch. After the single ionization of ${\mathrm{H}}_{2}$, our results show that the produced ${\mathrm{H}}_{2}^{+}$ takes almost the same time in the one-photon and net-two-photon dissociation pathways to stretch to the internuclear distance of the one-photon coupled dipole-transition between the ground and excited electronic states. The spatiotemporal mapping character of the polarization-skewed laser field provides us a straightforward route to clock the ultrafast dynamics of molecules with sub-optical-cycle time resolution.
- Published
- 2019
- Full Text
- View/download PDF
6. Comparison Study of Strong-Field Ionization of Molecules and Atoms by Bicircular Two-Color Femtosecond Laser Pulses
- Author
-
Xiaochun Gong, Qiying Song, Jing Chen, Hui Li, Junyang Ma, Kang Lin, Peifen Lu, Xinyan Jia, Feng He, Wenbin Zhang, Heping Zeng, Hanxiao Li, Qinying Ji, Zuqing Yu, and Jian Wu
- Subjects
Physics ,Field (physics) ,Double ionization ,General Physics and Astronomy ,Electron ,Laser ,01 natural sciences ,law.invention ,Atmospheric-pressure laser ionization ,010309 optics ,law ,Ionization ,0103 physical sciences ,Femtosecond ,Molecule ,Atomic physics ,010306 general physics - Abstract
We experimentally investigate the single and double ionization of N_{2} and O_{2} molecules in bicircular two-color femtosecond laser pulses, and compare with their companion atoms of Ar and Xe with comparable ionization thresholds. Electron recollision assisted enhanced ionization is observed in N_{2} and Ar by controlling the helicity and field ratio between the two colors, whereas the enhanced ionization via the recollision is almost absent in O_{2} and Xe. Our S-matrix simulations clearly reveal the crucial role of the detailed electronic structures of N_{2} and O_{2} on the two-dimensional recollision of the electrons driven by the bicircular two-color laser fields. As compared to Ar, the resonant multiphoton excitation dominates the double ionization of Xe.
- Published
- 2017
7. Visualizing and Steering Dissociative Frustrated Double Ionization of Hydrogen Molecules
- Author
-
Heping Zeng, Jian Wu, Xiaochun Gong, Kang Lin, Zuqing Yu, Fenghao Sun, Peifen Lu, Qinying Ji, Wenbin Zhang, Junjie Qiang, Hui Li, Hanxiao Li, Junping Wang, Feng He, Qiying Song, and Junyang Ma
- Subjects
Physics ,Double ionization ,General Physics and Astronomy ,Electron ,Optical field ,Laser ,01 natural sciences ,law.invention ,010309 optics ,law ,Ionization ,0103 physical sciences ,Rydberg atom ,Physics::Atomic and Molecular Clusters ,Molecule ,Physics::Atomic Physics ,Physics::Chemical Physics ,Atomic physics ,010306 general physics ,Quantum tunnelling - Abstract
We experimentally visualize the dissociative frustrated double ionization of hydrogen molecules by using few-cycle laser pulses in a pump-probe scheme, in which process the tunneling ionized electron is recaptured by one of the outgoing nuclei of the breaking molecule. Three internuclear distances are recognized to enhance the dissociative frustrated double ionization of molecules at different instants after the first ionization step. The recapture of the electron can be further steered to one of the outgoing nuclei as desired by using phase-controlled two-color laser pulses. Both the experimental measurements and numerical simulations suggest that the Rydberg atom is favored to emit to the direction of the maximum of the asymmetric optical field. Our results on the one hand intuitively visualize the dissociative frustrated double ionization of molecules, and on the other hand open the possibility to selectively excite the heavy fragment ejected from a molecule.
- Published
- 2017
8. Energy-Resolved Ultrashort Delays of Photoelectron Emission Clocked by Orthogonal Two-Color Laser Fields
- Author
-
Heping Zeng, Qinying Ji, Wenbin Zhang, Yunquan Liu, Qiying Song, Weifeng Yang, Peifen Lu, Feng He, Jian Wu, Junyang Ma, Kang Lin, Xiaochun Gong, and Cheng Lin
- Subjects
Materials science ,Sideband ,Physics::Instrumentation and Detectors ,business.industry ,Photoemission spectroscopy ,Attosecond ,General Physics and Astronomy ,Photoelectric effect ,Laser ,01 natural sciences ,law.invention ,010309 optics ,symbols.namesake ,Optics ,law ,Ionization ,0103 physical sciences ,Femtosecond ,Physics::Atomic and Molecular Clusters ,Rydberg formula ,symbols ,Physics::Atomic Physics ,Atomic physics ,010306 general physics ,business - Abstract
A phase-controlled orthogonal two-color (OTC) femtosecond laser pulse is employed to probe the time delay of photoelectron emission in the strong-field ionization of atoms. The OTC field spatiotemporally steers the emission dynamics of the photoelectrons and meanwhile allows us to unambiguously distinguish the main and sideband peaks of the above-threshold ionization spectrum. The relative phase shift between the main and sideband peaks, retrieved from the phase-of-phase of the photoelectron spectrum as a function of the laser phase, gradually decreases with increasing electron energy, and becomes zero for the fast electron which is mainly produced by the rescattering process. Furthermore, a Freeman resonance delay of 140±40 attoseconds between photoelectrons emitted via the 4f and 5p Rydberg states of argon is observed.
- Published
- 2016
9. Photon Energy Deposition in Strong-Field Single Ionization of Multielectron Molecules
- Author
-
Qiying Song, Zhichao Li, Jian Wu, Junyang Ma, Qinying Ji, Kang Lin, Xiaochun Gong, Peifen Lu, Heping Zeng, Feng He, and Wenbin Zhang
- Subjects
Physics ,education.field_of_study ,Photon ,Population ,General Physics and Astronomy ,Electron ,Photoionization ,Photon energy ,01 natural sciences ,Dissociation (chemistry) ,010305 fluids & plasmas ,Atomic orbital ,Ionization ,0103 physical sciences ,Physics::Atomic and Molecular Clusters ,Physics::Chemical Physics ,Atomic physics ,010306 general physics ,education - Abstract
Molecules exposed to strong laser fields may coherently absorb multiple photons and deposit the energy into electrons and nuclei, triggering the succeeding dynamics as the primary stage of the light-molecule interaction. We experimentally explore the electron-nuclear sharing of the absorbed photon energy in above-threshold multiphoton single ionization of multielectron molecules. Using CO as a prototype, vibrational and orbital resolved electron-nuclear sharing of the photon energy is observed. Different from the simplest one- or two-electron systems, the participation of the multiple orbitals and the coupling of various electronic states in the strong-field ionization and dissociation processes alter the photon energy deposition dynamics of the multielectron molecule. The population of numerous vibrational states of the molecular cation as the energy reservoir in the ionization process plays an important role in photon energy sharing between the emitted electron and the nuclear fragments.
- Published
- 2016
- Full Text
- View/download PDF
10. Clocking Dissociative Above-Threshold Double Ionization of H2 in a Multicycle Laser Pulse.
- Author
-
Shengzhe Pan, Wenbin Zhang, Hui Li, Chenxu Lu, Weihua Zhang, Qinying Ji, Hanxiao Li, Fenghao Sun, Junjie Qiang, Fei Chen, Jihong Tong, Lianrong Zhou, Wenyu Jiang, Xiaochun Gong, Peifen Lu, and Jian Wu
- Subjects
- *
LASER pulses , *ELECTRON emission , *FEMTOSECOND pulses , *CHEMICAL bonds , *ULTRASHORT laser pulses , *KINETIC energy , *FEMTOSECOND lasers - Abstract
The dissociative above-threshold double ionization (ATDI) of H2 in strong laser fields involves the sequential releasing of two electrons at specific instants with the stretching of the molecular bond. By mapping the releasing instants of two electrons to their emission directions in a multicycle polarization-skewed femtosecond laser pulse, we experimentally clock the dissociative ATDI of H2 via distinct photon-number-resolved pathways, which are distinguished in the kinetic energy release spectrum of two protons measured in coincidence. The timings of the experimentally resolved dissociative ATDI pathways are in good accordance with the classical predictions. Our results verify the multiphoton scenario of the dissociative ATDI of H2 in both time and energy fashion, strengthening the understanding of the strong-field phenomenon and providing a robust tool with a subcycle time resolution to clock abundant ultrafast dynamics of molecules. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
11. Visualizing and Steering Dissociative Frustrated Double Ionization of Hydrogen Molecules.
- Author
-
Wenbin Zhang, Zuqing Yu, Xiaochun Gong, Junping Wang, Peifen Lu, Hui Li, Qiying Song, Qinying Ji, Kang Lin, Junyang Ma, Hanxiao Li, Fenghao Sun, Junjie Qiang, Heping Zeng, Feng He, and Jian Wu
- Subjects
- *
IONIZATION (Atomic physics) , *LASER pulses , *RYDBERG states - Abstract
We experimentally visualize the dissociative frustrated double ionization of hydrogen molecules by using few-cycle laser pulses in a pump-probe scheme, in which process the tunneling ionized electron is recaptured by one of the outgoing nuclei of the breaking molecule. Three internuclear distances are recognized to enhance the dissociative frustrated double ionization of molecules at different instants after the first ionization step. The recapture of the electron can be further steered to one of the outgoing nuclei as desired by using phase-controlled two-color laser pulses. Both the experimental measurements and numerical simulations suggest that the Rydberg atom is favored to emit to the direction of the maximum of the asymmetric optical field. Our results on the one hand intuitively visualize the dissociative frustrated double ionization of molecules, and on the other hand open the possibility to selectively excite the heavy fragment ejected from a molecule. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
12. Photon Energy Deposition in Strong-Field Single Ionization of Multielectron Molecules.
- Author
-
Wenbin Zhang, Zhichao Li, Peifen Lu, Xiaochun Gong, Qiying Song, Qinying Ji, Kang Lin, Junyang Ma, Feng He, Heping Zeng, and Jian Wu
- Subjects
- *
FIELD ionization , *MULTIPHOTON ionization , *NUCLEAR vibrational states - Abstract
Molecules exposed to strong laser fields may coherently absorb multiple photons and deposit the energy into electrons and nuclei, triggering the succeeding dynamics as the primary stage of the light-molecule interaction. We experimentally explore the electron-nuclear sharing of the absorbed photon energy in above-threshold multiphoton single ionization of multielectron molecules. Using CO as a prototype, vibrational and orbital resolved electron-nuclear sharing of the photon energy is observed. Different from the simplest one- or two-electron systems, the participation of the multiple orbitals and the coupling of various electronic states in the strong-field ionization and dissociation processes alter the photon energy deposition dynamics of the multielectron molecule. The population of numerous vibrational states of the molecular cation as the energy reservoir in the ionization process plays an important role in photon energy sharing between the emitted electron and the nuclear fragments. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF
13. Transient Valence Charge Localization in Strong-Field Dissociative Ionization of HCl Molecules.
- Author
-
Junyang Ma, Liang Xu, Hongcheng Ni, Chenxu Lu, Wenbin Zhang, Peifen Lu, Jin Wen, Feng He, Faucher, Olivier, and Jian Wu
- Subjects
- *
FEMTOSECOND pulses , *ELECTRON impact ionization , *MOMENTUM distributions , *ANGULAR distribution (Nuclear physics) , *ELECTRON tunneling , *LIGHT sources - Abstract
Probing transient charge localization in the innershell orbital of atoms and molecules has been made possible by the recent progress of advanced light sources. Here, we demonstrate that the ultrafast electron tunneling ionization by an intense femtosecond laser pulse could induce an asymmetric transient charge localization in the valence shell of the HCl molecule during the dissociative ionization process. The transient charge localization is encoded in the laser impulse acquired by the outgoing ionic fragments, and the asymmetry is revealed by carefully examining the electron tunneling-site distinguished momentum angular distribution of the ejected H+ fragments. Our work proposes a way to visualize the transient valence charge motion and will stimulate further investigations of the tunneling-site-sensitive ultrafast dynamics of molecules in strong laser fields. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
14. Timing Dissociative Ionization of H2 Using a Polarization-Skewed Femtosecond Laser Pulse.
- Author
-
Qinying Ji, Shengzhe Pan, Peilun He, Junping Wang, Peifen Lu, Hui Li, Xiaochun Gong, Kang Lin, Wenbin Zhang, Junyang Ma, Hanxiao Li, Chungang Duan, Peng Liu, Ya Bai, Ruxin Li, Feng He, and Jian Wu
- Subjects
- *
PHOTOELECTRONS , *FEMTOSECOND pulses , *COINCIDENCE - Abstract
We experimentally observe the bond stretching time of one-photon and net-two-photon dissociation pathways of singly ionized H2 molecules driven by a polarization-skewed femtosecond laser pulse. By measuring the angular distributions of the ejected photoelectron and nuclear fragments in coincidence, the cycle-changing polarization of the laser field enables us to clock the photon-ionization starting time and photon-dissociation stopping time, analogous to a stopwatch. After the single ionization of H2, our results show that the produced H+2 takes almost the same time in the one-photon and net-two-photon dissociation pathways to stretch to the internuclear distance of the one-photon coupled dipole-transition between the ground and excited electronic states. The spatiotemporal mapping character of the polarization-skewed laser field provides us a straightforward route to clock the ultrafast dynamics of molecules with sub-optical-cycle time resolution. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
15. Comparison Study of Strong-Field Ionization of Molecules and Atoms by Bicircular Two-Color Femtosecond Laser Pulses.
- Author
-
Kang Lin, Xinyan Jia, Zuqing Yu, Feng He, Junyang Ma, Hui Li, Xiaochun Gong, Qiying Song, Qinying Ji, Wenbin Zhang, Hanxiao Li, Peifen Lu, Heping Zeng, Jing Chen, and Jian Wu
- Subjects
- *
FEMTOSECOND lasers , *FIELD ionization , *XENON compounds - Abstract
We experimentally investigate the single and double ionization of N2 and O2 molecules in bicircular two-color femtosecond laser pulses, and compare with their companion atoms of Ar and Xe with comparable ionization thresholds. Electron recollision assisted enhanced ionization is observed in N2 and Ar by controlling the helicity and field ratio between the two colors, whereas the enhanced ionization via the recollision is almost absent in O2 and Xe. Our S-matrix simulations clearly reveal the crucial role of the detailed electronic structures of N2 and O2 on the two-dimensional recollision of the electrons driven by the bicircular two-color laser fields. As compared to Ar, the resonant multiphoton excitation dominates the double ionization of Xe. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
16. Energy-Resolved Ultrashort Delays of Photoelectron Emission Clocked by Orthogonal Two-Color Laser Fields.
- Author
-
Xiaochun Gong, Cheng Lin, Feng He, Qiying Song, Kang Lin, Qinying Ji, Wenbin Zhang, Junyang Ma, Peifen Lu, Yunquan Liu, Heping Zeng, Weifeng Yang, and Jian Wu
- Subjects
- *
IONIZATION (Atomic physics) , *LASER pulses , *PHOTOELECTRONS - Abstract
A phase-controlled orthogonal two-color (OTC) femtosecond laser pulse is employed to probe the time delay of photoelectron emission in the strong-field ionization of atoms. The OTC field spatiotemporally steers the emission dynamics of the photoelectrons and meanwhile allows us to unambiguously distinguish the main and sideband peaks of the above-threshold ionization spectrum. The relative phase shift between the main and sideband peaks, retrieved from the phase-of-phase of the photoelectron spectrum as a function of the laser phase, gradually decreases with increasing electron energy, and becomes zero for the fast electron which is mainly produced by the rescattering process. Furthermore, a Freeman resonance delay of 140 ± 40 attoseconds between photoelectrons emitted via the 4 f and 5 p Rydberg states of argon is observed. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
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