A5113019116- Atomic and Molecular Physics
- Mass Spectrometry Techniques and Applications
- Advanced Chemical Physics Studies
- Fullerene Chemistry and Applications
- Laser-induced spectroscopy and plasma
- Ion-surface interactions and analysis
- Laser-Matter Interactions and Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Diamond and Carbon-based Materials Research
- Spectroscopy and Laser Applications
- Analytical chemistry methods development
- Particle accelerators and beam dynamics
- Polymer Nanocomposite Synthesis and Irradiation
- Nuclear physics research studies
- X-ray Spectroscopy and Fluorescence Analysis
- Laser Material Processing Techniques
- Laser-Plasma Interactions and Diagnostics
- Atomic and Subatomic Physics Research
- Quantum Information and Cryptography
- nanoparticles nucleation surface interactions
- High-pressure geophysics and materials
- Plasma and Flow Control in Aerodynamics
- Color Science and Applications
- Advanced Nanomaterials in Catalysis
- Mercury impact and mitigation studies
Institute of Modern Physics
2016-2025
University of Chinese Academy of Sciences
2006-2025
Chinese Academy of Sciences
2015-2024
Ji Hua Laboratory
2022-2024
To meet the application needs for cesium (Cs) extraction from salt-lake brines, present work explores a laser-induced breakdown spectroscopy (LIBS) method that facilitates sample analysis by near the...
A dedicated platform for multi-disciplinary research with highly charged ions has been constructed, and an all-permanent magnet ECR ion source was built installed in the beamline. Five experimental terminals are established interdisciplinary Research. The high voltage supplied to reached 320 kV. commissioning of is successful, different beams have provided studies, current status will be reported.
An experimental study on the packing thickness (PT) dependent plasma emission caused by laser ablating thin-layer microgranular samples in air was conducted using three sets of size-selected copper grains (median...
Optical emission of plasma induced by a pulsed laser ablating the surface randomly packed granular (RPG) material in air is investigated experimentally, taking sieved copper microspheres with discrete diameters, d, ranging from 49 to 390 \textmu{}m as examples. We find steplike phenomenon (also called critical-like phenomenon) dependence on grain size: when d less than critical size, only weak emissions are detected; however, exceeds abruptly become at least 5 times stronger. Such can be...
We present a velocity-map imaging (VMI) apparatus coupled with magneto-optical trap (MOT) of 87Rb atoms designed for low-energy photo-ion spectroscopy. The VMI-electrode geometry uses three-electrode configuration, and the focusing electric field is optimized based on systematic simulations relatively ions. To calibrate apparatus, we use resonant two-color two-photon ionization rubidium as Doppler-selected This VMI system provides an accuracy 0.15 m/s resolution 7.5 photoions speeds below...
Hot C(60) molecules under nanosecond laser excitation decay by a variety of fragmentation channels. An experimental search has been made to determine the temperature fragmented C(60)via analyzing momentum distributions prompt ionic fragments C(n)(+) (n ≤ 58). It was found that all precursors appearing as these have almost same and shows little variation with fluences in our limited range. The results provide clear evidence first-order phase transition is occurring at this temperature. value...
The ratio of ionic to atomic lines with surface rigidity implying the feasibility characterizing soft mechanical properties using LIBS.
State-selective single electron capture cross sections are measured by recoil ion momentum spectroscopy technique for He2+ on He at 30 keV incident energy. The into ground and excited states obtained compared to classical model calculations as well the quantum mechanical calculations. experimental results in good agreement with results.
In collisions between slow F2+ ions (30 keV) and molecular targets, adenine, scattered particle production yields have been measured directly by simultaneous detection of neutrals, positive negative ions. The relative cross-section for a ion formation channel was to be 1%. Despite slight decrease compared larger target, the fullerene C60, cross section is still at least one order magnitude than yield in ion–atom interactions.
Autoionization decay from doubly excited states of ${\mathrm{Ne}}^{6+}[1{s}^{2}3lnl$ ($n=3,4,5$)] (symmetric configurations) as well the Coster-Kronig transition ${\mathrm{Ne}}^{6+}[1{s}^{2}2pnl(n\ensuremath{\geqslant}7)]$ (asymmetric are observed in transfer ionization reaction channel 80 keV/u ${\mathrm{Ne}}^{8+}$-He collisions. It has been predicted that formation symmetric configurations results uncorrelated double-electron capture processes [Z. Chen and C. D. Lin, Phys. Rev. A 48, 1298...
Compared with the macrosystem case, phase transition occurring in fragmenting cluster systems depicts a much richer story. However, most experimental observations have been restricted to an extremely partial view of this picture due technical limitations large-range scan energy deposited selected system. Here, taking charge-selected C${}_{60}$${}^{3+}$ and C${}_{60}$${}^{4+}$ as model systems, we experimentally explore fragmentation (FPT) over large range directly observe some important...
Grain size is one of the most important physical parameters for randomly packed granular (RPG) materials. Its estimation, especially in situ, plays a key role many natural and industrial processes. Here, application laser-induced breakdown spectroscopy (LIBS) was investigated experimentally to estimate grain RPG The experiment performed by taking sieved copper microspheres with discrete median diameters ranging from 53 357 μm as examples measuring plasma emissions induced 1064 nm laser...
Plasma emission intensity as a function of laser fluence exhibited role transition grain size effect on plasma with and indicated that there exists stemming from mechanical properties granular materials.
We have implemented an approach to investigate the space charge effect (SCE) in ultracold ion bunch produced through near-threshold photoionization of laser-cooled rubidium atoms trapped a magneto-optical trap. The non-linear broadening spatial profile induced by SCE within initial density range 3.7 × 106–4.5 107/cm3 was explored using time-of-flight spectrometer coupled with imaging detector. A charged particle tracing simulation accounting for all pairwise ion–ion Coulomb interactions and...
Electron emission occurring in transfer ionization for He${}^{2+}$ collisions with argon has been investigated using cold target recoil ion momentum spectroscopy. The double differential cross sections electron capture to the continuum of projectile (cusp-shaped electrons) are presented collision energies from 17.5 75 keV/u. For an energy 30 keV/u, we find a maximum experimental ratio cusp-shaped yield total yield. This result is explained terms velocity matching between and initially bound...
Delayed deprotonation dissociation of dications two ${\mathrm{C}}_{3}{\mathrm{H}}_{4}$ isomers, propyne and allene, induced by 50 keV/u ${\mathrm{Ne}}^{8+}$ ions is investigated employing the reaction microscope technique. The survival time precursor ${\mathrm{C}}_{3}\mathrm{H}{{}_{4}}^{2+}$ retrieved according to time-of-flight difference between ionic fragments recorded in coincidence. spectra isomers exhibit very similar distributions, demonstrating that initial structure isomer does not...
We propose an approach to determine the excitation energy distribution due multiphoton absorption in case of excited systems following decays produce different ion species. This is based on measurement time-resolved photoion position spectrum by using velocity map imaging spectrometry and unfocused laser beam with a low fluence homogeneous profile. Such allows us identify species origin each detected depict pure Poisson's equation involving only one variable which proportional absolute...