A5074165022- Advanced Chemical Physics Studies
- Mass Spectrometry Techniques and Applications
- Laser-Matter Interactions and Applications
- Atomic and Molecular Physics
- Spectroscopy and Quantum Chemical Studies
- Cold Atom Physics and Bose-Einstein Condensates
- Laser-induced spectroscopy and plasma
- Ion-surface interactions and analysis
- Quantum, superfluid, helium dynamics
- Laser Design and Applications
- Photochemistry and Electron Transfer Studies
- Force Microscopy Techniques and Applications
- Molecular Junctions and Nanostructures
- Spectroscopy and Laser Applications
- Molecular Spectroscopy and Structure
- Plasma Diagnostics and Applications
- Synthesis and Properties of Aromatic Compounds
- Dust and Plasma Wave Phenomena
- Particle accelerators and beam dynamics
Institute of Applied Physics and Computational Mathematics
2017-2025
Peking University
2023
Chinese Academy of Engineering
2019
Harbin Institute of Technology
2015-2017
How the neighbor effect plays its role in fragmentation of molecular clusters attracts great attention for physicists and chemists. Here, we study this N_{2}O dimer by performing three-body coincidence measurements on femtosecond timescale. Rotations bound N_{2}O^{+} triggered neutral or ionic neighbors are tracked. The forbidden dissociation path between B^{2}Π ^{4}Π is opened spin-exchange due to existence ions, leading a new channel N_{2}O^{+}→NO+N^{+} originating from B^{2}Π. formation...
Abstract In this paper, rotational dynamics simulations of neutral O 2 molecule driven by linearly, elliptically and circularly polarized femtosecond pulsed laser are carried out using a full quantum time-dependent wave packet evolution method. Here, the propagation direction is set along z axis, polarization plane restricted to xy plane. The results indicate that alignment in weakly affected varying ellipticity when total intensity held constant. For rotation within plane, linearly...
We investigate the intermolecular nonradiative charge transfer process in a double hydrogen-bonded formic acid (FA) dimer, initiated by electron-collision induced ionization of one FA molecule. Through fragment ions and electron coincident momentum measurements ab initio calculations, we obtain direct evidence that from neighboring molecule to fill two vacancies occurs potential energy curve crossing FA^{++}+FA with FA^{+}+FA^{+*} curves, forming an electronic excited state dicationic...
Abstract Real-time imaging of transient structure the electronic excited state is fundamentally critical to understand and control ultrafast molecular dynamics. The ejection electrons from inner-shell valence level can lead population different states, which trigger manifold relaxation processes, however, accurate such state-dependent structural evolutions still lacking. Here, by developing laser-induced electron recollision-assisted Coulomb explosion approach dynamics simulations, snapshots...
In this Letter, we propose a novel laser-induced inelastic diffraction (LIID) scheme based on the intense-field-driven atomic nonsequential double ionization (NSDI) process and demonstrate that, with LIID approach, doubly differential cross sections (DDCSs) of target ions, e.g., ${\mathrm{Ar}}^{+}$ ${\mathrm{Xe}}^{+}$, can be accurately extracted from two-dimensional photoelectron momentum distributions in NSDI corresponding atoms. The DDCSs exhibit strong dependence both laser intensity,...
Abstract Van der Waals clusters are weakly bound atomic/molecular systems and an important medium for understanding micro-environmental chemical phenomena in bio-systems. The presence of neighboring atoms may open channels otherwise forbidden isolated atoms/molecules. In hydrogen-bond clusters, proton transfer plays a crucial role, which involves mass charge migration over large distances within the cluster results its fragmentation. Here we report exotic channel involving heavy N + ion...
Coulomb-explosion imaging is a broadly employed technique to reconstruct the geometry of molecules from direct multibody breakups its ions. However, we reveal that this fails for large class systems, such as (${\mathrm{CO})}_{2}{}^{3+}$ and ${\mathrm{ArCO}}^{3+}$, since events ``direct breakup channel'' are not real but rapid sequential with short-lived ultrafast-rotational fragment. Using Ar-CO prototype, have investigated theoretically process. We find due interfield between metastable...
We experimentally investigate the ultrafast photodissociation dynamics of SO2 molecule induced by intense ultrashort laser pulses in a pump-probe scheme. Different three-body fragmentation pathways are discriminated using time-dependent kinetic energy release spectrum with femtosecond time resolution. A nontrivial pathway, denoted as bonding is unraveled, which an intermediate fast rotating O2 formed before complete fragmentation. The chemical bond rearrangement after electron tracked real...
Coupled nuclear and electronic dynamics within a molecule are key to understanding broad range of fundamental physical chemical processes. Although probing the coupled vibrational was demonstrated, it has so far been challenging observe coupling interactions between rotational degrees freedom. Here, we report first observation Coriolis coupling, interaction angular momentum axial momentum, during laser-induced molecular fragmentation by tracing structure dissociating <mml:math...
We extracted the molecular-frame elastic differential cross sections (MFDCSs) for electrons scattering from N_{2}^{+} based on elliptical laser-induced electron diffraction (ELIED), wherein structural evolution is initialized by same tunneling ionization and probed incident angle-resolved imaging. To establish ELIED, an intuitive interpretation of ellipticity-dependent rescattering momentum distributions was first provided analyzing transverse distribution. It shown that angle returning...
We investigate the above-threshold multiphoton ionization of H_{2} embedded in superfluid He nanodroplets driven by ultraviolet femtosecond laser pulses. find that surrounding atoms enhance dissociation in-droplet H_{2}^{+} from lower vibrational states as compared to isolated gas-phase molecules. As a result, discrete peaks photoelectron energy spectrum correlated with HHe^{+} dissociative molecule shift higher energies. Based on electron-nuclear correlation, photoelectrons energies are...
Two-body fragmentation of ${\mathrm{N}}_{2}{\mathrm{O}}^{q+}$ ($q=2,3$) induced by electron-capture collision $5.7\ensuremath{-}\mathrm{keV}/\mathrm{u}\phantom{\rule{0.28em}{0ex}}\mathrm{X}{\mathrm{e}}^{15+}$ is studied. Through the triply coincident measurement on ion-pair fragments with scattered projectile and correlation analysis time flight momentum conservation, we have clearly identified 12 reaction channels for formation dissociation ${\mathrm{N}}_{2}{\mathrm{O}}^{2+}$...
We investigate the doubly excited 3Pe resonance states of two-electron positive ions Li+, Be2+, B3+, and C4+ by employing correlated exponential wave functions. In framework stabilization method, we calculate two series (3pnp 3dnd) resonances below N = 3 threshold. The parameters (resonance energies widths) are reported for first time as a function screening parameter. For free-atomic cases, comparisons made with results few time.
Imaging the charge distributions and structures of molecules clusters will promote understanding dynamics quantum system. Here, we report a method by using an Ar atom as tip to probe benzene (Bz) cations in gas phase. Remarkably, measured Bz + ( δ H = 0.204, C −0.037) 2+ 0.248, 0.0853) agree well with calculated Mulliken distributions, 2 is reconstructed distributions. The two isomers (T-shaped PD isomers) can be resolved from inter-molecular potential V R ) between ions, dimer theoretical...
We present the absolute triple differential cross section (TDCS) for single ionization of $\mathrm{Ne}(2p)$ at an impact energy 599.6 eV and $\mathrm{Ar}(3p)$ 195 eV. The role postcollision interaction (PCI) is studied using a high-order distorted-wave Born approximation model with continuum distorted-waves expansion. Both second- third-order effects are considered in calculations, distorted wave reported $(e,2e)$ reaction. calculated results show satisfactory agreement experimental data....
Charge transfer processes between weakly bound entities play an important role in various chemical and biological environments. In this combined experimental theoretical work, we investigate the nature of charge-transfer homogeneous atomic heterogeneous atomic-molecular clusters. Our results reveal fundamentally different to be at pure argon clusters compared mixed argon-nitrogen systems: We demonstrate that former species decay via photon-mediated charge while a nonradiative direct process...
We developed a full quantum time-dependent wave-packet evolution method to simulate the multibody breakups of polyatomic molecular ions. The interaction picture theory was used propagate wave packet, where effects strong and long-range interactions are considered by basis functions weak short-range included in perturbation term. In this method, Coulomb interactions, polycentric vibration-rotation coupling fragments, rotation-rotation between fragment parent molecule accurately. Using we...
Pathways of two-body fragmentation BrCNq+ (q = 2, 3) have been explored by combined experimental and theoretical studies. In the experiment, BrCN molecule is ionized 1 keV electron impact created fragment ions are detected using an ion momentum imaging spectrometer. Six channels identified. By measuring vectors ions, kinetic energy release (KER) distributions for these determined. Theoretically, potential curves as a function Br-C C-N internuclear distances calculated complete active space...
In this paper, we propose a new polarization potential model based on second-order quantum perturbation theory to describe effects (e, 2e) reactions at intermediate energy. Differently from previous models, nine singly excited states are accurately considered in the present model. Compared with other approximate shows similar asymptotic behavior, but differs strongly close-core region. Using all of potentials third-order distorted-wave Born approximation calculations, good agreement...
In our last study [J. Phys. B At. Mol. Opt. 54, 125,102 (2021).], we reported the ab initio calculation of full-dimensional potential energy surfaces water molecule including 9 A’ and A” states in Cs symmetry. this study, performed additional non-adiabatic semi-classical studies based on surfaces. Our simulation successfully repeated near picosecond lifetime <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="m1"><mml:mrow><mml:msup><mml:mover accent="true"><mml:mi...
Received 1 December 2017DOI:https://doi.org/10.1103/PhysRevA.96.069903©2017 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasElectronic excitation & ionizationAtomic, Molecular Optical