A5058068989- Atomic and Molecular Physics
- Mass Spectrometry Techniques and Applications
- Advanced Chemical Physics Studies
- Ion-surface interactions and analysis
- Nuclear physics research studies
- X-ray Spectroscopy and Fluorescence Analysis
- Laser-Matter Interactions and Applications
- Laser-induced spectroscopy and plasma
- Cold Atom Physics and Bose-Einstein Condensates
- Food composition and properties
- Proteins in Food Systems
- DNA and Nucleic Acid Chemistry
- Laser-Plasma Interactions and Diagnostics
- Atomic and Subatomic Physics Research
- Astro and Planetary Science
- Microbial Metabolites in Food Biotechnology
- Nuclear Physics and Applications
- Adipokines, Inflammation, and Metabolic Diseases
- Tea Polyphenols and Effects
- Magnetic confinement fusion research
- Phytochemicals and Antioxidant Activities
- Stellar, planetary, and galactic studies
- Polysaccharides Composition and Applications
- Radiation Effects and Dosimetry
- Radiation Therapy and Dosimetry
Institute of Modern Physics
2016-2025
China Agricultural University
2023-2025
University of Chinese Academy of Sciences
2011-2025
Hebei Agricultural University
2025
Ansteel (China)
2024
Chinese Academy of Sciences
2015-2024
GSI Helmholtz Centre for Heavy Ion Research
2021
Lanzhou City University
2018
Intermolecular Coulombic decay (ICD) is considered a general phenomenon that plays key role in many fundamental and applied fields related to biological environments. In cases, however, the mechanisms efficiency of ICD have yet be uncovered. A prominent example heavy-ion cancer therapy. Here, we report first detection damaging intermolecular relaxation cascade initiated by bombardment hydrated pyrimidine clusters. The process can significantly contribute high effectiveness irradiation thus...
Electron emission from the single-electron capture with simultaneous single ionization in 30 keV/u He${}^{2+}$ on argon was investigated using a reaction microscope, providing electron energy spectra and momentum distributions. Intensive peaks for electrons near-zero kinetic energies have been observed. It is demonstrated that mechanisms contributing to include direct transfer (DTI), double-electron autoionization (DECA), (SECA) of target. Comparison resonance shows Ar${}^{+}$ ions SECA...
Recent experimental studies have questioned the validity of spin statistics assumptions, particularly in charge exchange processes occurring atomic MeV collisions. Here, we study spin-resolved single electron capture collisions between ${\mathrm{C}}^{3+}$ ions and helium within an energy range $1.25--400\text{ }\mathrm{keV}/\mathrm{u}$. Using high resolution reaction microscope multielectronic theoretical approaches, directly measure calculate true population information...
Abstract The cross sections of state-selective charge exchange (CX) between highly charged ions and neutrals are important for modeling extreme ultraviolet soft X-ray emissions in many astrophysical objects with hot plasma impacting cold media. By using cold-target recoil-ion momentum spectroscopy, we measure O 6+ CX collisions He H 2 the collision energy range 19.5 to 100 keV amu −1 . relative single reported electron capture into 5+ (1 s nl ) n = 2, 3, 4, 5, ≥6 , respectively. With...
Abstract A study on the fragmentation of NO q + (q=2,3) molecular ions produced by collisions between 96 keV O 6+ and neutral molecules, using cold target recoil ion momentum spectrometer (COLTRIMS), is conducted. The kinetic energy release (KER) for various dissociation channels was obtained. For channel 2+ → N , double-electron capture followed autoionization projectile dominant process, which can be explained recapture loosely bound electrons into highly excited states target. 3+...
Abstract State-selective single- and double-electron capture processes in collisions of S 5+ ions with helium at energies ranging from 50.8 to 100 keV were investigated using cold target recoil ion momentum spectroscopy (COLTRIMS). Q-value spectra projectile scattering angle distributions obtained. For single electron capture, into n = 3 states the is dominant. As energy increases, contribution 4 was observed. Experimental relative cross-sections for single-electron different final compared...
We measured the kinetic energy distributions of fragment ions doubly and quadruply ionized argon dimers using 3000 eV electron impact. For dissociation (Ar${}_{2}$)${}^{2+}$, peak that indicates radiative charge transfer is observed, where outer-shell ionization (dominant in highly charged ion collision) inner-shell (preferential x-ray experiments) have approximately equal contributions. (Ar${}_{2}$)${}^{4+}$, interatomic Coulombic decay electron-transfer-mediated are first observed...
An experimental investigation of the breakup ${(\mathrm{C}{\mathrm{O}}_{2})}^{3+}$ induced by $\mathrm{N}{\mathrm{e}}^{4+}$ ion impact at incident energies 1.12 MeV was performed. By analyzing momentum distributions and kinetic three fragment ions, nonsequential sequential dissociation mechanisms are verified. In contrast to highly charged impact, two different decay pathways were observed in present experiment. One pathway originates from primary cation populated into...
Abstract Charge exchange between highly charged ions and neutral atoms molecules has been considered as one of the important mechanisms controlling soft X-ray emissions in many astrophysical objects environments. However, for modeling charge emission, data n- l -resolved state-selective capture cross sections are often obtained by empirical semiclassical theory calculations. With a newly built cold target recoil-ion momentum spectroscopy (COLTRIMS) apparatus, we perform series measurements...
Breakup dynamics of ${\mathrm{C}}_{2}\mathrm{H}{{}_{2}}^{3+}$ $\ensuremath{\rightarrow}$ ${\mathrm{H}}^{+}+{\mathrm{H}}^{+}+\mathrm{C}{{}_{2}}^{+}$ induced by 50-keV/u ${\mathrm{Ne}}^{8+}$ ion impact is investigated employing a reaction microscope. All three ionic fragments in the final state are detected coincidence, and their momentum vectors as well kinetic energies determined. The kinetic-energy correlation spectrum two protons displays very rich structures. Utilizing Newton diagrams...
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...
Abstract The state-resolved capture cross sections for principal n and orbital angular momentum l play an important role in modeling soft X-ray emissions induced by charge exchange many astrophysical environments. However, the empirical semiclassical theories used to produce these data of - -resolved state-selective have not been well tested. Using cold target recoil ion spectroscopy apparatus at Fudan University, we perform a series measurements Ar 8+ with He collision energy range from 1.4...
The research progresses on the investigations of atomic structure and collision dynamics with highly charged ions based heavy ion storage rings electron beam traps in recent 20 years are reviewed. part covers test quantum electrodynamics correlation strong Coulomb field studied through dielectronic recombination spectroscopy VUV/x-ray spectroscopy. includes charge exchange ion–atom collisions mainly Bohr velocity region, ion-induced fragmentation mechanisms molecules, hydrogen-bound van de...
We report the formation of H<sub>2</sub><sup>+</sup> and C<sub>2</sub><sup>+</sup> from dissociation acetylene induced by α-particle irradiation.
Abstract Although the biological hazard of alpha‐particle radiation is well‐recognized, molecular mechanisms biodamage are still far from being understood. Irreparable lesions in biomolecules may not only have mechanical origin but also appear due to various electronic and nuclear relaxation processes ionized states produced by an impact. Two such were identified present study considering acetylene dimer, a biologically relevant system possessing intermolecular hydrogen bond. The first...
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 report an experimental and theoretical study of state-selective charge exchange processes in ${\mathrm{Ar}}^{8+}$ on He collisions at 1 3 keV/amu, benchmarking the fundamental electron capture dynamics under strong perturbations. The quantum-state selectivity has been experimentally resolved for one $1s$ into $4s$, $4p$, $4d+4f$, $5s$ states ${\mathrm{Ar}}^{7+}$ ion along with corresponding scattering angle differential cross sections. By comparing to calculations a two-active-electron...
The three-body fragmentation dynamics of cyclopropane $({\text{C}}_{3}{\text{H}}_{6})$ induced by ${\text{Ni}}^{19+}$ ions at an impact energy 5.8 MeV/u are studied using a cold target recoil ion momentum spectroscopy (COLTRIMS) reaction microscope. Two completely measured channels ${\text{C}}_{3}{\text{H}}_{6}^{3+}$ were identified definitely, i.e., ${\text{C}}_{3}{\text{H}}_{6}^{3+}\ensuremath{\rightarrow}{\text{H}}^{+}+\text{C}{\text{H}}_{2}^{+}+{\text{C}}_{2}{\text{H}}_{3}^{+}$ and...
This paper presents a novel reaction microscope designed for ion–atom collision investigations, established at the Institute of Modern Physics, Chinese Academy Sciences, Lanzhou, China. Its time-of-flight (TOF) spectrometer employs an innovative flight-time focusing method consisting two acceleration regions, providing optimal time conditions charged fragments with diverse initial velocities. The TOF spectrometer’s axis intentionally tilts by 12° relative to ion beam direction, preventing...
State-selective electron capture cross sections and projectile scattering-angle differential for single-electron in collisions of protons with He at energies ranging from 50 to 100 keV have been experimentally investigated by means a reaction microscope. It is shown that the ground-state transfer dominant channel, excited-state has relative small contributions sections. The transfer-excitation process minor contribution total As energy increases, remains dominant, but transfers become more...