A5031276484- Atomic and Molecular Physics
- X-ray Spectroscopy and Fluorescence Analysis
- Ion-surface interactions and analysis
- Electron and X-Ray Spectroscopy Techniques
- Nuclear Physics and Applications
- Mass Spectrometry Techniques and Applications
- Advanced Chemical Physics Studies
- Photocathodes and Microchannel Plates
- Laser-induced spectroscopy and plasma
- Radiation Therapy and Dosimetry
- Cold Atom Physics and Bose-Einstein Condensates
- Laser-Matter Interactions and Applications
- Nuclear physics research studies
- Particle accelerators and beam dynamics
- Plasma Diagnostics and Applications
- Particle Detector Development and Performance
- Spectroscopy and Laser Applications
- Particle Accelerators and Free-Electron Lasers
- Solid State Laser Technologies
- Advanced Fiber Laser Technologies
- Radiation Effects in Electronics
- Nanopore and Nanochannel Transport Studies
- CCD and CMOS Imaging Sensors
- Analytical Chemistry and Sensors
- Atomic and Subatomic Physics Research
Chinese Academy of Sciences
2016-2025
Institute of Modern Physics
2016-2025
University of Chinese Academy of Sciences
2019-2025
Nanjing Water Conservancy Planning & Design Institute (China)
2024
Changchun Institute of Optics, Fine Mechanics and Physics
2023-2024
St Petersburg University
2022
Brown University
2018-2022
Yancheng Institute of Technology
2019
National University of Defense Technology
2019
Henan University of Urban Construction
2011
We present a comprehensive study of the angular distribution photons emitted during resonant two-photon electron capture by H-like uranium ions. Focusing on energies incident electrons, for which dielectronic recombination (DR) dominates, we analyze emission spectrum most significant cascade transitions, make main contribution to total cross section. In particular, consider transitions that occur with formation $(1s2s)$ and $(1s2p)$ intermediate states. investigate beyond single-photon...
The line ratios in X-ray emission resulting from charge exchange between highly charged ions (HCIs) and neutral atoms are not only crucial for accurately modeling astrophysical emissions but also offer a unique perspective on the processes happening during collisions. K spectra following Mg11+ He presented collision velocity of 1489 km/s (11.5 keV/amu). were measured by two Silicon Drift Detectors capable resolving Mg10+ Kα, Kβ, Kγ, Kδ+ lines. intensity relative to Kα line, as well hardness...
We present a Faraday Cup Array (FCA) beam profile monitor designed for rapid monitoring of high-intensity direct current ion beams. The consists 2112 small cups (FCs) arranged uniformly in grid pattern over an area 89.2 × mm2. These FCs are rows and columns, forming 64 independent channels, which evenly split into 32 x-channels y-channels, with each channel comprising 33 FCs. Each is connected to 64-channel picoammeter, allowing all channels conduct measurements simultaneously independently....
The transmission of high-current electrons through a tapered SiO2 capillary was investigated. angular distribution and incident energy dependence transmitted were observed. We found that the fraction decreases with energy. had significant loss but could not be focused by capillary.
X-ray spectra of K-shell hollow krypton atoms produced in single collisions with 52 - 197 MeV/u Xe54+ ions are measured a heavy-ion storage ring equipped an internal gas-jet target. Energy shifts the K{\alpha}_1,2^s, K{\alpha}_1,2^(h,s), and K\b{eta}_1,3^s transitions obtained. Thus, average number spectator L-vacancies presented during x-ray emission is deduced. From relative intensities K{\alpha}_1,2^s K{\alpha}_1,2^(h,s) transitions, ratio to singly ionized determined be 14 24%. In...
Abstract A wide-band, high-resolution vacuum flat-crystal spectrometer was developed for analyzing the x-rays spectra of hollow atoms. The designed to cover an energy dynamic range 0.6 16 keV by combining different flat crystals and x-ray CCD detector mounted on a twistable bellows that could modulate Bragg angles ranging from 25° 50°.The performance evaluated in 3–12 measuring K L generated 10–30 electron beam collisions with solid titanium, silver gold targets, respectively. typical...
We present a study of two-photon electron capture by H-like uranium ions. The energy the incident was chosen to be in region with most significant contribution dielectronic recombination. studied photon emission spectrum. In particular, we calculated differential over cross section including main resonance groups corresponding cascade transitions, and low-energy region, where infrared divergence required special processing. calculations were performed within framework QED theory. importance...
The transmission of low-energy (1100eV-1500eV) electrons through SiO2 tube was investigated, the distribution transmitted beam current observed. Results indicate that intensity is proportional to relative incident and angular divergence reduced when energy increased.
This paper reports laboratory measurements of the spectrum highly ionized sulfur. The S ix–S xiii has been observed in wavelength range 170–500 Å. A total 54 lines have measured. Forty-two them classified as 2s22pk–2s2pk+1 and 2s2pk–2pk+1 transitions. Twelve other ascribed to 2s–2p, 4p–5s, 5p–6s, 5d–6p, 6p–8d These spectral identified, among which 22 are new accurately analysis spectra was based on a comparison with experimental results calculated values.
A compact and low noise charge sensitive spectroscopy amplifier which can be integrated into position micro-channel plate (MCP) detectors has been constructed. The was optimized by using a wave form generator tested chevron shape MCP detector. output of 4 mVrms achieved while the gain is 1012 V/C shaping time 700 ns.
Target ionization and projectile charge changing were investigated for 20--500 keV/u ${\text{C}}^{q+}$, ${\text{O}}^{q+}+\text{He}$ $(q=1--3)$ collisions. Double- to single-ionization ratios ${R}_{21}$ of helium associated with no change (direct ionization), single-electron capture, loss measured. The cross-section ratio depends strongly on the collision velocity $v$, state $q$, outgoing reaction channel. Meanwhile, a model extended from our previous work [J. X. Shao, M. Chen, B. W. Ding,...
Ultrasonic cavitation is shown to hamper the supercooling required for nucleation of water. To elucidate mechanism ice under ultrasonic cavitation, ultrasound waves were applied supercooled water with oxygen contents 4.06, 4.48, 4.95, 5.62, and 6.34 mg L−1. intermittently at temperatures below 0 °C. Nucleation measured different experimental conditions. The maximum temperature (−3.66 ± 0.39 °C) was observed a sample containing 4.95 L−1 oxygen, 319 W power (electric ultrasound). At W,...
Abstract An all-optical method for generating ultra-intense high-order-mode light pulse is investigated with three-dimensional particle-in-cell simulation. We find that the conversion from a short intense circularly polarized incident Gaussian laser into transverse magnetic (TM) mode occurs as it propagates micro plasma waveguide. The strength of longitudinal electric field excited TM modes can be almost two orders magnitude higher than original laser. simulation results show that,...