Nd L-shell x-ray emission induced by light ions

Zhou, Xianming; Wei, Jing; Cheng, Rui; Chen, Yanhong; Mei, Ce-Xiang; Zeng, Lizhong; Liu, Yu; Zhang, Yanning; Liang, Chen; Zhao, Yongtao; Zhang, Xiaoan

doi:10.1088/1674-1056/ac4488

Cited by 6 publications

(6 citation statements)

References 31 publications

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“…本实验是在中国科学院近代物理研究所 320 kV实验平台1#终端上进行的, 相关装置和技术已在原有工作中介绍 [16,17] , 实验装置示意图如图1. 实验所需离子, 在电子回旋共振离子源中, 由14.5 GHz的馈入微波离化产生, 特定电荷态由 90°磁铁偏转选择得到, 不同能量在加速管中由调节加速电压获得.…”

Section: 实验装置unclassified

K-shell X-ray of Al produced by collisions of ions with near Bohr velocities

Zhou¹,

Wei²,

Cheng³

et al. 2023

Acta Phys. Sin.

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X-ray emissionproduced by highly charged ions with the energy range near the Bohr velocity involves complicated atomic process. However, duo to the limitation of experimental conditions, the relevant researches are nearly absent. It is unclear whether the existing theory is applicable in such an energy range. This needs further exploring. In the present work, K X-ray spectra of Al excited by H+, He2+ and highly charged heavy ions I22+ and Xe20+ are investigated by using an Si drift X-ray detector in the energy range near the Bohr velocity. The X-ray production cross sections are extracted from the X-ray counts and compared with the theoretical simulations from PWBA, ECPSSR and modified BEA model. It is indicated that the cross section increases with the augment of projectile energy. With the same incident energy per nucleon, the cross section induced by highly charged heavy ions is a factor of about 104 larger than that by light ions . With the impact of H+ and He2+ ions, the K-shell electrons are mainly knocked off through the direct Coulomb ionization, and the X-ray emission cross section can be well predicted by ECPSSR theory. For the bombardment of highly charged heavy ions I22+ and Xe20+, except for the Coulomb ionization, the orbital electrons can also be excited by electron capture. The BEA simulation after being modified by both Coulomb repulsion and effective charge can well predict the x-ray production cross section.

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Section: 实验装置unclassified

K-shell X-ray of Al produced by collisions of ions with near Bohr velocities

Zhou¹,

Wei²,

Cheng³

et al. 2023

Acta Phys. Sin.

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“…Similar to the TMS of ZnIn 2 S 4 mentioned in Section 4.5, Zn x Cd 1−x S‐based heterojunction photocatalysts have also been widely studied. Some recently reported Zn x Cd 1−x S‐based heterojunction photocatalysts are type‐I CdS@Zn x Cd 1−x S/WS 2 ; [ 231 ] type‐II Zn x Cd 1−x S/CoAl‐LDH, [ 232 ] Zn x Cd 1−x S/CdS, [ 233 ] and Zn 0.5 Cd 0.5 S/NiSe 2 ; [ 234 ] p–n heterojunction Zn x Cd 1−x S/Co 3 O 4 , [ 235 ] Zn 0.7 Cd 0.3 S/NiWO 4 ; [ 236 ] Z‐scheme Zn 0.7 Cd 0.3 S/Fe 2 O 3 , [ 237 ] Zn 0.4 Cd 0.6 S/α‐Fe 2 O 3 ; [ 238 ] and S‐scheme Zn x Cd 1−x S/Co 9 S 8 , [ 239 ] Zn x Cd 1−x S/NiAl‐LDH. [ 240 ] The corresponding heterojunction components and charge transfer routes are shown in Figure .…”

Section: Mms‐based Heterojunction Photocatalysts For Phe Via Water Sp...mentioning

confidence: 99%

Section: Mms‐based Heterojunction Photocatalysts For Phe Via Water Sp...mentioning

confidence: 99%

Heterojunction Engineering of Multinary Metal Sulfide‐Based Photocatalysts for Efficient Photocatalytic Hydrogen Evolution

Song,

Zheng,

Yang

et al. 2023

Advanced Materials

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Photocatalytic hydrogen evolution (PHE) via water splitting using semiconductor photocatalysts is an effective path to solve the current energy crisis and environmental pollution. Heterojunction photocatalysts, containing two or more semiconductors, exhibit better PHE rates than those with only one semiconductor owing to the altered band alignment at the interface and stronger driving force for charge separation. Traditional binary metal sulfide (BMS)‐based heterojunction photocatalysts, such as CdS, MoS2, and PbS, demonstrate excellent PHE performance. However, the recently developed multinary metal sulfide (MMS)‐based photocatalysts possess favorable chemical stability, tunable band structure, and flexible element compositions, and have considerable potential to realize higher PHE rates than those of BMSs. In this review article, the mechanism of PHE is first elucidated and then various single and heterojunction MMS‐based photocatalysts and their charge transfer behaviors and PHE performances are systematically summarized. A perspective on potential future research directions in this field is concluded.

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“…Therefore, when constructing tunnels in areas with high groundwater levels, new types of drains can be employed to minimize water seepage and leakage issues, such as siphon drains and drains under electromagnetic fields (Zhou et al, 2018). Siphon drainage pipes prevent blockages caused by particle deposits through separating water and soil, and pipes under electromagnetic fields can prevent the formation of crystals.…”

Section: Diseases Of Water Leakagementioning

confidence: 99%

Research on the dismantling of double-arch tunnel after long-term service—the case study of Huangmeishan Tunnel demolition project

Kou,

Li,

Xie

et al. 2023

Front. Earth Sci.

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Mountain tunnel structures are subject to a variety of diseases with increasing service life. Earlier tunnels may need to be demolished and expanded because of the poor serving capacity. But few studies of tunnel demolition projects are available. Based on the demolition project of Huangmeishan Tunnel, this paper discusses the demolition scheme of the double-arch tunnel, calculates the stability of the slope, and investigates the defects and material performance in the tunnel. The water leakage in the tunnel mainly occurred at the mid-partition wall and the drainage pipe was clogged severely. The largest width of the crack detected is 15 mm. Material performance tests indicated that the concrete material strength exceeded the design values. In the loading test, the largest displacements of the tunnel arch and haunch were 1.73 and 1.32 mm, which verified the safety of heavy vehicles in construction. Finally, suggestions are given to avoid similar phenomena in other tunnels during the design, construction, and operation phase. The novelty of this study lies in its comprehensive analysis of a tunnel demolition project. The findings of this study contribute to enhancing the knowledge and understanding of tunnel demolition and support the safe and efficient execution of future demolition projects.

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Nd L-shell x-ray emission induced by light ions

Cited by 6 publications

References 31 publications

K-shell X-ray of Al produced by collisions of ions with near Bohr velocities

K-shell X-ray of Al produced by collisions of ions with near Bohr velocities

Heterojunction Engineering of Multinary Metal Sulfide‐Based Photocatalysts for Efficient Photocatalytic Hydrogen Evolution

Research on the dismantling of double-arch tunnel after long-term service—the case study of Huangmeishan Tunnel demolition project

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