A5062282256- Atomic and Molecular Physics
- Mass Spectrometry Techniques and Applications
- Ion-surface interactions and analysis
- Advanced Chemical Physics Studies
- Atmospheric Ozone and Climate
- Solar and Space Plasma Dynamics
- X-ray Spectroscopy and Fluorescence Analysis
- Astro and Planetary Science
- Plasma Applications and Diagnostics
- Quantum, superfluid, helium dynamics
- Laser-Matter Interactions and Applications
- Ionosphere and magnetosphere dynamics
- Nuclear physics research studies
- Astronomical and nuclear sciences
- Plasma Diagnostics and Applications
- Atomic and Subatomic Physics Research
- Laser-induced spectroscopy and plasma
- Ammonia Synthesis and Nitrogen Reduction
Fudan University
2020-2023
Institute of Modern Physics
2020-2023
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 Hydrogen migration plays an important role in the chemistry of hydrocarbons which considerably influences their chemical functions. The one or more hydrogen atoms occurring hydrocarbon cations has opportunity to produce simplest polyatomic molecule, i.e. H 3 + . Here we present a combined experimental and theoretical study formation dynamics from ethane dication. experiment is performed by 300 eV electron impact ionization pronounced yield C 2 coincidence channel observed. quantum...
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...
Dissociation of $\mathrm{OC}{\mathrm{S}}^{q+}$ $(q=3--7)$ produced by $18\text{\ensuremath{-}}\mathrm{keV}/\mathrm{u}\phantom{\rule{0.16em}{0ex}}{\mathrm{Ne}}^{8+}$ ion impact has been investigated using recoil momentum spectroscopy. Ten complete three-body Coulomb fragmentation channels were analyzed. Scattered projectile charge state $({\mathrm{Ne}}^{7+} \mathrm{or} {\mathrm{Ne}}^{6+})$ differentiated branching ratios and the kinetic-energy release (KER) distributions analyzed for...
Abstract The absolute electron capture cross sections for single and double charge exchanges (CEs) between the highly charged ion O 6+ CO 2 , CH 4 H N dominant collision processes in solar wind, have been measured energies from 7 keV · q (2.63 u −1 ) to 52 (19.5 ). These measurements were carried out new experimental instrument setup at Fudan University, errors of CEs 1 σ confidence level about 11% 16%, respectively. Limited agreement is achieved with results calculated by classical...
Hydrogen- or proton-migration-induced isomerization has recently been of concern for its critical role in the dissociation organic molecules astrophysical biological relevance. Herein we present a combined experimental and theoretical study two-body C–C bond breakdown ethane dication. For asymmetric fragmentation channel CH2+ + CH4+, kinetic energy release measurements ab initio quantum chemical calculations demonstrate that reaction pathway involving hydrogen-migration-induced [CH3–CH3]2+...
We experimentally investigated the delayed fragmentation processes of ethylene and allene dications induced by 300-eV electrons with cold target recoil ion momentum spectroscopy in an observation window up to \ensuremath{\sim}2 \ensuremath{\mu}s. For each molecule, several distinct pathways involving prompt or fragmentations were observed relative branching ratios among them analyzed. According time-of-flight coincidence measurements corresponding ionic fragments, survival times thus...
In this article we present the three-body fragmentation dynamics of ${\mathrm{C}}_{2}{{\mathrm{H}}_{4}}^{3+}$ caused by $18\text{\ensuremath{-}}\mathrm{keV}/\mathrm{u}\phantom{\rule{0.16em}{0ex}}{\mathrm{Ne}}^{8+}$ ion impact. Utilizing cold target recoil momentum spectroscopy, complete kinematical information three channels, i.e., ${\mathrm{C}}_{2}{{\mathrm{H}}_{4}}^{3+}\ensuremath{\rightarrow}{\mathrm{H}}^{+}+{\mathrm{H}}^{+}+{\mathrm{C}}_{2}{{\mathrm{H}}_{2}}^{+},...
The three-body fragmentation channel ${\mathrm{H}}^{+}+{\mathrm{H}}^{+}+{\mathrm{C}}_{3}{\mathrm{H}}_{2}{}^{+}$ of the allene trication produced by 30-keV/u ${\mathrm{He}}^{2+}$ ion impact is investigated using cold-target recoil-ion momentum spectroscopy. two protons with different kinetic energies are found emitted sequentially from parent trication. presence such a sequential deprotonation process and absence corresponding concerted may result major molecular deformation process, e.g.,...
Electron capture in the collision of highly charged ions with atoms and molecules is a fundamental process related to electron transition between bound states belonging two atomic-centers. The X-ray emission after important for astrophysical modeling, fusion plasma diagnostics, ion irradiated biophysics. In past few decades, momentum-imaging cold-target recoil momentum spectroscopy has been significantly developed technique widely used measure quantum state-selective population processes....
Abstract Charge exchange is a predominant process in inelastic collisions astronomical plasmas, influencing the charge state balance and leading to X-ray emissions when solar wind ions interact with neutral gas astrophysical environments. Accurate analysis of these dynamic properties diagnose composition velocities, as well spatial distribution heliospheric gas, can be hindered by limited availability relevant electron capture studies corresponding energy range. The absolute total <mml:math...
The C-C bond cleavage dissociation of ethylene dication produced by 18-keV/u ${\mathrm{Ne}}^{8+}$ impact is investigated combining experimental measurement and theoretical calculation. Using cold target recoil ion momentum spectroscopy, two channels, i.e., the symmetric fragmentation, ${\mathrm{C}}_{2}\mathrm{H}{{}_{4}}^{2+} \ensuremath{\rightarrow} \mathrm{C}\mathrm{H}{{}_{2}}^{+}+\mathrm{C}\mathrm{H}{{}_{2}}^{+}$, isomeric one, \mathrm{C}{\mathrm{H}}^{+}+\mathrm{C}\mathrm{H}{{}_{3}}^{+}$,...
The absolute electron capture cross sections for single and double charge exchanges between the highly charged ions O6+ CO2, CH4, H2, N2, dominant collision processes in solar wind, have been measured energy from 7 keV*q (2.63 keV/u) to 52 (19.5 keV/u). These measurements were carried out new experimental instrument set up at Fudan University, error of 1{\sigma} confidence level are about 11% 16%, respectively. Limited agreement is achieved with results calculated by classical over-barrier...