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Measurement of quantum defects of nS and nD states using field ionization spectroscopy in ultracold cesium atoms 被引量:1
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作者 张临杰 冯志刚 +3 位作者 李安玲 赵建明 李昌勇 贾锁堂 《Chinese Physics B》 SCIE EI CAS CSCD 2009年第5期1838-1842,共5页
This paper reports that ultracold atoms are populated into different nS and nD Rydberg states (n=25-52) by two-photon excitation. The ionization spectrum of an ultracold Rydberg atom is acquired in a cesium magneto-... This paper reports that ultracold atoms are populated into different nS and nD Rydberg states (n=25-52) by two-photon excitation. The ionization spectrum of an ultracold Rydberg atom is acquired in a cesium magneto-optical trap by using the method of pulse field ionization. This denotes nS and nD states in the ionization spectrum and fits the data of energy levels of different Rydberg states to obtain quantum defects of nS and nD states. 展开更多
关键词 ultracold Rydberg atoms quantum defect field ionization spectrum two-photon excitation
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An effective quantum defect theory for the diamagnetic spectrum of a barium Rydberg atom
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作者 李波 刘红平 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第1期23-26,共4页
A theoretical calculation is carried out to investigate the spectrum of a barium Rydberg atom in an external magnetic field. Using an effective approach incorporating quantum defect into the centrifugal term in the Ha... A theoretical calculation is carried out to investigate the spectrum of a barium Rydberg atom in an external magnetic field. Using an effective approach incorporating quantum defect into the centrifugal term in the Hamiltonian, we reexamine the reported spectrum of the barium Rydberg atom in a magnetic field of 2.89 T [J. Phys. B 28 L537 (1995)]. Our calculation employs B-spline basis expansion and complex coordinate rotation techniques. For single photon absorption from the ground 6s2 to 6snp Rydberg states, the spectrum is not influenced by quantum defects of channels ns and nd. The calculation is in agreement with the experimental observations until the energy reaches E = -60 cm-1. Beyond this energy, closer to the threshold, the calculated and experimental results do not agree with each other. Possible reasons for their discrepancies are discussed. Our study affirms an energy range where the diamagnetic spectrum of the barium atom can be explained thoroughly using a hydrogen model potential. 展开更多
关键词 diamagnetic spectrum quantum defect barium Rydberg atom
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Energy level analyses of even-parity J=1 and 2 Rydberg states of Sn I by multichannel quantum defect theory
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作者 由帅 凤艳艳 戴振文 《Chinese Physics B》 SCIE EI CAS CSCD 2009年第6期2229-2237,共9页
This paper analyzes the energy levels along the even-parity J = 1 and 2 Rydberg series of Sn I by multichannel quantum defect theory. A good agreement between theoretical and experimental energy levels was achieved. B... This paper analyzes the energy levels along the even-parity J = 1 and 2 Rydberg series of Sn I by multichannel quantum defect theory. A good agreement between theoretical and experimental energy levels was achieved. Below 59198 cm^-1, a total of 85 and 23 new energy levels, respectively, in the J = 1 and J = 2 series, which cannot be measured previously by experiments, are predicted in this work. Based on the calculated admixture coefficients of each channel, interchannel interactions were discussed in detail. The results are helpful to understand the characteristics of configuration interaction among even-parity levels in Sn I. 展开更多
关键词 atom Sn Rydberg state multichannel quantum defect theory
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Exact quantum defect theory approach for lithium in magnetic fields
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作者 徐家坤 陈海清 刘红平 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第1期183-186,共4页
We calculate the diamagnetic spectrum of lithium at highly excited states up to the positive energy range using the exact quantum defect theory approach. The concerned excitation is one-photon transition from the grou... We calculate the diamagnetic spectrum of lithium at highly excited states up to the positive energy range using the exact quantum defect theory approach. The concerned excitation is one-photon transition from the ground state 2s to the highly excited states np with π and σ polarizations respectively. Lithium has a small quantum defect value 0.05 for the np states, and its diamagnetic spectrum is very similar to that of hydrogen in the energy range approaching the ionization limit. However, a careful calculation shows that the spectrum has a significant discrepancy with that of hydrogen when the energy is lower than -70 cm-1. The effect of the quantum defect is also discussed for the Stark spectrum. It is found that the σ transition to the np states in an electric field has a similar behavior to that of hydrogen due to zero interaction with channel ns. 展开更多
关键词 diamagnetic spectrum quantum defect theory
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USTERQUANTUM3型清纱器清纱疵点分析与跟踪
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作者 王俊英 《棉纺织技术》 CAS 北大核心 2023年第9期60-63,共4页
为充分发挥USTER QUANTUM 3型清纱器的清纱效能,减少布面纱线疵点,对该清纱器的清纱疵点NSLT的分析方法和来源追溯进行研究。分析了NSLT纱疵的外形特点和产生原因。研究结果表明:利用清纱器的抓纱疵功能,将纱疵收集在纱疵卡上分析纱疵来... 为充分发挥USTER QUANTUM 3型清纱器的清纱效能,减少布面纱线疵点,对该清纱器的清纱疵点NSLT的分析方法和来源追溯进行研究。分析了NSLT纱疵的外形特点和产生原因。研究结果表明:利用清纱器的抓纱疵功能,将纱疵收集在纱疵卡上分析纱疵来源,结合用户反馈可进一步优化清纱工艺参数;通过清纱器的“概况”功能,可以观察某个班次某种纱疵概况和每个锭子的具体情况,对波动大的纱疵应分析原因,对纱疵出现频率高的锭子应追溯纱疵来源。认为:企业应建立纱疵监控数据、模拟图跟踪机制,制定跟踪计划,一旦发现纱疵数据和纱疵模拟图变化较大,可立即启动突发性纱疵分析机制,以减少布面质量波动、原材料消耗和机物料消耗。 展开更多
关键词 USTER quantum 3型清纱器 清纱疵点 抓纱疵 纱疵卡 模拟图
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Energy levels of perturbed 6pnd J = 2 Rydberg states of Pb I by multichannel quantum defect theory
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作者 戴振文 蒋红玫 +2 位作者 刘靖尧 彭慰先 蒋占魁 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2003年第5期542-551,共10页
Energy levels of the odd-parity 6pnd J=2 Rydberg states of atomic lead are analyzed by the multichannel quantum defect theory (MQDT) with previous experimental energy levels. The obtained. Using these parameters, admi... Energy levels of the odd-parity 6pnd J=2 Rydberg states of atomic lead are analyzed by the multichannel quantum defect theory (MQDT) with previous experimental energy levels. The obtained. Using these parameters, admixture coefficients for each level are calculated to designate the level denotations. The results show that strong channel mixings exist for the levels near the 6pnd (3/2)[5/2]2 0 and 6p6d (3/2)[3/2]2 0 pertubers. The five-channel model different from that in literature is used to predict 21 energy positions of 6pnd (1/2)[3/2]2 0 levels and to determine the denotations of all the 6pnd J=2 Rydberg states under 59788 cm?1 for Pb I. 展开更多
关键词 lead RYDBERG energy level MULTICHANNEL quantum defect theory.
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长波段半导体激光泵浦光纤激光器实现2 kW功率输出
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作者 王鹏 孟祥明 +11 位作者 吴函烁 叶云 杨保来 奚小明 史尘 张汉伟 王小林 习锋杰 王泽锋 许晓军 周朴 陈金宝 《强激光与粒子束》 CAS CSCD 北大核心 2024年第3期82-84,共3页
半导体激光(LD)泵浦的高功率光纤激光器具有效率高、体积小、重量轻、稳定性好等优点,在工业加工等诸多领域都有着广泛的应用。为了提高泵浦光吸收率,传统光纤激光器常用915 nm和976 nm波段的LD作为激光的泵浦源。在该类LD泵浦的光纤激... 半导体激光(LD)泵浦的高功率光纤激光器具有效率高、体积小、重量轻、稳定性好等优点,在工业加工等诸多领域都有着广泛的应用。为了提高泵浦光吸收率,传统光纤激光器常用915 nm和976 nm波段的LD作为激光的泵浦源。在该类LD泵浦的光纤激光器中,由于量子亏损和泵浦吸收系数相对较高,光纤激光器的热致模式不稳定(TMI)阈值相对较低。为了提高量子效率和潜在的TMI阈值,提出采用大于1010 nm波段的LD直接泵浦光纤激光器,产生高量子效率激光。搭建了振荡放大一体化的全光纤激光器,采用总泵浦功率为2.56 kW的1010 nm波段LD泵浦,首次获得输出功率2.05 kW、光束质量M^(2)约1.7的激光。后续将通过进一步增大泵浦功率、优化光纤特性以实现更高功率、更优光束质量的光纤激光输出。 展开更多
关键词 光纤激光器 量子亏损 振荡放大一体化 模式不稳定
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位移电流测试方法的改进及应用 被引量:1
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作者 纪文宇 张汉壮 《物理与工程》 2024年第1期30-34,66,共6页
自从麦克斯韦第一次提出位移电流这一概念之后,其在薄膜表征中便得到广泛的应用。然而,在课堂教学中,极少涉及位移电流的测试原理及相关应用讲解,更缺少对其实际应用的介绍。本文从位移电流的测试原理出发,联系实际应用,提出了基于周期... 自从麦克斯韦第一次提出位移电流这一概念之后,其在薄膜表征中便得到广泛的应用。然而,在课堂教学中,极少涉及位移电流的测试原理及相关应用讲解,更缺少对其实际应用的介绍。本文从位移电流的测试原理出发,联系实际应用,提出了基于周期性阶跃电压驱动的电流测量(CPSIV)的新方法。这将有效地加深学生对于位移电流物理本质的深入理解。同时,我们以量子点发光二极管(QLED)为平台,对这一新的测试方案进行了实验验证。针对其中空穴传输层薄膜的缺陷特性及其对器件性能的影响进行了表征,揭示了器件的发光开启机制,证实了我们方案的可靠性。 展开更多
关键词 麦克斯韦方程 位移电流 周期性阶跃电压 长寿命缺陷态 量子点发光二极管
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CsPbBr3量子点辅助结晶制备高效钙钛矿太阳能电池 被引量:1
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作者 李颖慧 刘钢 《湘潭大学学报(自然科学版)》 CAS 2024年第4期94-102,共9页
钙钛矿活性层是钙钛矿太阳电池中的重要组成部分,其成膜质量影响着钙钛矿太阳能电池的器件性能.该文介绍了一种晶体种子辅助钙钛矿薄膜结晶的方法,即在PbI2溶液中预先引入少量的CsPbBr3量子点作为种子晶体,诱导钙钛矿的自下而上结晶,促... 钙钛矿活性层是钙钛矿太阳电池中的重要组成部分,其成膜质量影响着钙钛矿太阳能电池的器件性能.该文介绍了一种晶体种子辅助钙钛矿薄膜结晶的方法,即在PbI2溶液中预先引入少量的CsPbBr3量子点作为种子晶体,诱导钙钛矿的自下而上结晶,促使形成高质量的钙钛矿薄膜.扫描电子显微镜结果显示,CsPbBr3量子点引入后,钙钛矿薄膜形貌明显改善,晶粒增大、薄膜针孔消失,这表明了CsPbBr3量子点作为种子晶体能够促进钙钛矿薄膜晶粒生长,改善钙钛矿薄膜形貌.高质量的钙钛矿薄膜有助于减少钙钛矿晶界,提升光吸收性能,抑制光生载流子复合,进而提升器件的光电转换性能.最后,将改进后的钙钛矿薄膜组装成太阳能电池,其最佳光电转换效率为20.64%,相应的开路电压为1.08 V、短路电流为24.0 mA·cm^(-2)、填充因子为79.64%. 展开更多
关键词 CsPbBr3量子点 辅助结晶 晶界缺陷 钙钛矿太阳能电池
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喷墨打印用高稳定性水系ZnSe:Mn量子点的制备及光学性能研究
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作者 敬新柯 胡晓博 +2 位作者 王建成 王蒙蒙 曾赛 《广州化工》 CAS 2024年第15期20-24,31,共6页
水系锰离子掺杂硒化锌(ZnSe:Mn)量子点因其可大规模合成、环境友好无毒性而受到研究者们的广泛关注。然而,表面缺陷多易引起晶体氧化分解、纳米晶体自净化效应导致离子掺杂困难等问题,极大地降低了ZnSe:Mn量子点的荧光性能及其稳定性,... 水系锰离子掺杂硒化锌(ZnSe:Mn)量子点因其可大规模合成、环境友好无毒性而受到研究者们的广泛关注。然而,表面缺陷多易引起晶体氧化分解、纳米晶体自净化效应导致离子掺杂困难等问题,极大地降低了ZnSe:Mn量子点的荧光性能及其稳定性,并限制其实际应用。本文利用合适比例的异丙醇/水混合溶液和稀氢氧化钠溶液,通过“整体防御”结合“局部修复”的两步法改性策略对ZnSe:Mn量子点表面进行后处理,得到表面改性后的ZnSe:Mn量子点,并进行X射线衍射、X射线光电子能谱、荧光光谱、电子自旋共振波谱仪等测试表征。结果表明:该后处理技术可以简便高效地钝化ZnSe:Mn量子点的表面缺陷,大幅提高绝对量子产率至25%,并同时其稳定性得到显著提升,有效抑制了晶格的氧化解离过程,这为制备高性能的水溶性ZnSe:Mn量子点提供了可行途径。通过配制水性量子点墨水并进行喷墨打印演示,证明该材料有望作为一种可应用于塑料外观的新型品牌标记方式。 展开更多
关键词 ZnSe:Mn量子点 表面改性 缺陷钝化 荧光性能 喷墨打印
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氮化镓基Micro-LED侧壁对外量子效率的影响及侧壁处理技术综述 被引量:1
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作者 邝海 黄振 +1 位作者 熊志华 刘丽 《中国光学(中英文)》 EI CAS CSCD 北大核心 2023年第6期1305-1317,共13页
氮化镓基Micro-LED具备高亮度、高响应频率、低功耗等优点,是未来显示技术和可见光通信系统的理想选择,但是目前外量子效率(EQE)低下这一问题严重影响其规模化量产及进一步应用。为了突破EQE低下这一瓶颈,通过分析Micro-LED外量子效率... 氮化镓基Micro-LED具备高亮度、高响应频率、低功耗等优点,是未来显示技术和可见光通信系统的理想选择,但是目前外量子效率(EQE)低下这一问题严重影响其规模化量产及进一步应用。为了突破EQE低下这一瓶颈,通过分析Micro-LED外量子效率的影响因素,得知EQE下降的主要原因包括侧壁缺陷引起的载流子损耗及非辐射复合。总结了侧壁缺陷对载流子输运及复合的影响。综述了目前常用的侧壁处理技术及修复方法,指出现有侧壁处理方法较为笼统、针对性不足且载流子与侧壁缺陷的作用机理并不十分清楚。提出应深入系统地研究侧壁缺陷种类和分布、载流子与侧壁缺陷作用机制及侧壁处理过程中的缺陷修复模式。本文为提高外量子效率、加快Micro-LED商业化量产进程提供设计思路和理论依据。 展开更多
关键词 侧壁缺陷 微发光二极管 外量子效率 载流子 侧壁钝化
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Automatic Image Inspection of Fabric Defects Based on Optimal Gabor Filter
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作者 尉苗苗 李岳阳 +1 位作者 蒋高明 丛洪莲 《Journal of Donghua University(English Edition)》 EI CAS 2016年第4期545-548,共4页
An effective method for automatic image inspection of fabric defects is presented. The proposed method relies on a tuned 2D-Gabor filter and quantum-behaved particle swarm optimization( QPSO) algorithm. The proposed m... An effective method for automatic image inspection of fabric defects is presented. The proposed method relies on a tuned 2D-Gabor filter and quantum-behaved particle swarm optimization( QPSO) algorithm. The proposed method consists of two main steps:( 1) training and( 2) image inspection. In the image training process,the parameters of the 2D-Gabor filters can be tuned by QPSO algorithm to match with the texture features of a defect-free template. In the inspection process, each sample image under inspection is convoluted with the selected optimized Gabor filter.Then a simple thresholding scheme is applied to generating a binary segmented result. The performance of the proposed scheme is evaluated by using a standard fabric defects database from Cotton Incorporated. Good experimental results demonstrate the efficiency of proposed method. To further evaluate the performance of the proposed method,a real time test is performed based on an on-line defect detection system. The real time test results further demonstrate the effectiveness, stability and robustness of the proposed method,which is suitable for industrial production. 展开更多
关键词 fabric defect detection optimal Gabor filter quantum-behaved particle swarm optimization(QPSO) algorithm image segmentation
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Influence of Modified ZnO Quantum Dots and Nanostructures as New Antibacterials
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作者 Zahra Fakhroueian Faraz M. Harsini +3 位作者 Firoozeh Chalabian Fatemeh Katouzian Azizollah Shafiekhani Pegah Esmaeilzadeh 《Advances in Nanoparticles》 2013年第3期247-258,共12页
Antibacterial activities of various spherical zinc oxide nanoparticles and nano special morphological structures including quantum dots, nanorod arrays, nanoporous shapes and needle-like crystals had been investigated... Antibacterial activities of various spherical zinc oxide nanoparticles and nano special morphological structures including quantum dots, nanorod arrays, nanoporous shapes and needle-like crystals had been investigated as new nanomedicine compounds. Also antibacterial activity based on minimal inhibitory concentration and the growth inhibitory zone (well method) was evaluated. ZnO nanostructures were fabricated by novel hydrolysis sol-gel-hydrothermal process followed with rapid quenching as new technique using glycerine, vegetable fatty esters such as coconut, sunflower and Lauric alcohol ethoxylated as organic templates soluble in eco-friendly nanofluids. The results showed that Bacillus anthracis and Pseudomonas aerogenes were extremely sensitive to treatment with unique ZnO nanostructured. Their growth inhibitory zone presented 30 mm and 25 mm inhibition zone with better inhibitory effect compared to the Gentamicin antibiotic standard. ZnO nanostructures had also been indicated to have a wide range of antibacterial activities against both Gram-positive and Gram-negative bacteria especially more effective on (gr+) species using the growth inhibitory zone. We could design and make significant formulations of fatty acids and esters-capped ZnO quantum dots nanofluids which created high promising agents for controlling Anthrax, Staphylococcus epidermidis and their influences in antimicrobial properties with low cost for future. 展开更多
关键词 NANOBIOTECHNOLOGY ANTIBACTERIAL Activity HYDROLYSIS Sol-Gel-Hydrothermal ZnO quantum DOTS MIC and Well Method Complex defects
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线缺陷石墨烯纳米带的电输运研究 被引量:1
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作者 丁锦廷 胡沛佳 郭爱敏 《物理学报》 SCIE EI CAS CSCD 北大核心 2023年第15期221-226,共6页
石墨烯的能带工程是当前凝聚态物理的热点问题,旨在费米能级处打开能隙.另外实验报道石墨烯存在多种线缺陷,但人们尚未讨论线缺陷与石墨烯能带工程间的关系.本文采用Landauer-Büttiker公式及格林函数方法,研究了三种4-8环线缺陷随... 石墨烯的能带工程是当前凝聚态物理的热点问题,旨在费米能级处打开能隙.另外实验报道石墨烯存在多种线缺陷,但人们尚未讨论线缺陷与石墨烯能带工程间的关系.本文采用Landauer-Büttiker公式及格林函数方法,研究了三种4-8环线缺陷随机排列方式对石墨烯纳米带电输运的影响.计算结果发现:尽管4-8环线缺陷随机分布的石墨烯纳米带在费米能级处存在电子态,但该电子态为局域态且体系在费米能级处存在透射能隙,这是由线缺陷随机排列诱导产生结构无序进而引起的Anderson局域化现象.当线缺陷无序程度较低或纳米带宽度较窄时,石墨烯纳米带的透射能隙依赖4-8环线缺陷的随机排列方式;随着线缺陷无序程度的增强或纳米带宽度的增加,三种线缺陷石墨烯纳米带的透射能隙趋于一致.总之,4-8环线缺陷随机分布的石墨烯纳米带具有透射能隙,该能隙对线缺陷的排列方式、无序程度及纳米带宽度均表现稳健性. 展开更多
关键词 石墨烯纳米带 量子输运 线缺陷 格林函数
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质子辐照下三结GaAs太阳电池性能衰退分析
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作者 孙洪伟 郝建红 +3 位作者 赵强 范杰清 张芳 董志伟 《太阳能学报》 EI CAS CSCD 北大核心 2023年第7期129-134,共6页
在构建三结GaAs太阳电池模型的基础上,模拟分析不同能量质子辐照下中电池GaAs的性能衰退,对三结GaAs电池在轨服役评估具有重要意义。结合质子与电池靶材发生的相互作用,建立一种将微观损伤机理与宏观电池性能变化相结合的电池辐照损伤... 在构建三结GaAs太阳电池模型的基础上,模拟分析不同能量质子辐照下中电池GaAs的性能衰退,对三结GaAs电池在轨服役评估具有重要意义。结合质子与电池靶材发生的相互作用,建立一种将微观损伤机理与宏观电池性能变化相结合的电池辐照损伤评价方法。结果表明,在三结GaAs太阳电池中,40 keV能量的质子辐照对中电池的影响最小;100和150 keV能量的质子辐照主要对中电池基区造成影响,导致电池性能一定程度上的衰退;70 keV能量的质子辐照对于中电池结区的影响最大,从而导致量子效率QE和并联电阻Rsh的变化最为明显。 展开更多
关键词 太阳电池 质子辐照 砷化镓 量子效率 晶格缺陷
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1μm波段低量子亏损光纤激光研究进展(特邀)
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作者 许将明 张扬 +10 位作者 马小雅 叶俊 柯延钊 李思成 梁峻锐 何俊鸿 黄良金 潘志勇 姚天甫 冷进勇 周朴 《红外与激光工程》 EI CSCD 北大核心 2023年第6期237-249,共13页
量子亏损对高功率光纤激光器内的废热产生和光光转换效率具有重要影响,光纤激光器输出功率的提升过程可以视为不断与量子亏损作斗争的过程。文中梳理了近年来1μm波段低量子亏损光纤激光的重要进展,重点介绍了稀土掺杂增益和拉曼增益两... 量子亏损对高功率光纤激光器内的废热产生和光光转换效率具有重要影响,光纤激光器输出功率的提升过程可以视为不断与量子亏损作斗争的过程。文中梳理了近年来1μm波段低量子亏损光纤激光的重要进展,重点介绍了稀土掺杂增益和拉曼增益两种体制的光纤激光器在实现低量子亏损输出方面的相关工作。在稀土掺杂光纤激光器中,采用级联泵浦、多组分掺杂、强泵浦等技术可降低激光器的量子亏损,其中量子亏损≤1%的掺镱光纤激光器已实现400 mW功率输出。在拉曼光纤激光器中,通过采用特殊掺杂、泵浦光谱调控、增益竞争抑制等技术,量子亏损≤1%的拉曼光纤激光器已实现百瓦级功率输出,并成功验证包层泵浦方案的可行性,表明其在实现高功率低量子亏损输出方面具有重要潜力。 展开更多
关键词 光纤激光器 高功率 低量子亏损 掺镱光纤激光 拉曼光纤激光
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LaFeO_(3)/CQDs-g-C_(3)N_(x)催化剂的光催化性能研究
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作者 王祎迪 孙有为 +4 位作者 周峰 马会霞 王彦娟 胡绍争 张健 《燃料化学学报(中英文)》 EI CAS CSCD 北大核心 2023年第2期215-224,共10页
本实验制备了一种Z型含氮缺陷的石墨相氮化碳(LaFeO_(3)/CQDs-g-C_(3)N_(x))复合光催化剂。利用X射线衍射(XRD)、紫外-可见光漫反射(UV-Vis DRS)、光致发光光谱(PL)、扫描电镜(SEM)、透射电镜(TEM)以及X射线光电子能谱(XPS)等手段对催... 本实验制备了一种Z型含氮缺陷的石墨相氮化碳(LaFeO_(3)/CQDs-g-C_(3)N_(x))复合光催化剂。利用X射线衍射(XRD)、紫外-可见光漫反射(UV-Vis DRS)、光致发光光谱(PL)、扫描电镜(SEM)、透射电镜(TEM)以及X射线光电子能谱(XPS)等手段对催化剂进行了表征。结果表明,氮缺陷和CQDs的引入能增强光生载流子的迁移效率。LaFeO_(3)/CQDs-g-C_(3)N_(x)复合材料对罗丹明B(RhB)的光催化降解率是纯g-C_(3)N_(4)的3.98倍,并具有良好的光催化稳定性。同时对抗生素和其他有机污染物也表现出良好的降解能力。 展开更多
关键词 Z型异质结 氮缺陷 碳量子点 光催化
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芳香胺对硫化铅胶体量子点基质改性研究
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作者 代卓 潘瑞琨 《胶体与聚合物》 CAS 2023年第3期108-110,共3页
硫化铅量子点具有带隙可调、多激子效应等特性,被广泛应用于光电探测和太阳能电池等领域。然而,硫化铅胶体量子点(PbS QDs)表面被碘化铅基质(PbI_(2))所包覆,阻碍了载流子传输,并且在PbS晶面带来上更多缺陷位点。基于此,本文采用一种针... 硫化铅量子点具有带隙可调、多激子效应等特性,被广泛应用于光电探测和太阳能电池等领域。然而,硫化铅胶体量子点(PbS QDs)表面被碘化铅基质(PbI_(2))所包覆,阻碍了载流子传输,并且在PbS晶面带来上更多缺陷位点。基于此,本文采用一种针对量子点基质的原位协同钝化策略,即采用苯乙基碘化铵(PEAI)在合成过程中进行调控。X射线光电子能谱(XPS)及广角X射线衍射(GIWAXS)等结果表明调控后的量子点基质及缺陷位点均得到有效优化。 展开更多
关键词 硫化铅胶体量子点 基质调控 缺陷钝化
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Energy levels of 1s^2n d(n≤9)states for lithium-like ions 被引量:3
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作者 胡木宏 王治文 +2 位作者 曾凡伟 王涛 王晶 《Chinese Physics B》 SCIE EI CAS CSCD 2011年第8期169-175,共7页
The full-core plus correlation method with multi-configuration interaction wave functions is extended to the calcu- lation of the non-relativistic energies of ls2nd (n ≤9) states for the lithium isoelectronic seque... The full-core plus correlation method with multi-configuration interaction wave functions is extended to the calcu- lation of the non-relativistic energies of ls2nd (n ≤9) states for the lithium isoelectronic sequence from Z = 11 to 20. Relativistic and mass-polarization effects on the energy are calculated as the first-order perturbation correction. The quantum-electrodynamics correction is also included. The fine structure splittings are determined from the expectation values of spin-orbit and spin-other-orbit interaction operators in the Pauli-Breit approximation. Combining the term energies of lowly excited states obtained with the quantum defects calculated by the single channel quantum defect theory, each of which is a smooth function of energy and approximated by a weakly varying function of energy, the ion potentials of highly excited states (n ≥ 6) are obtained with the semi-empirical iteration method. The results are compared with experimental data in the literature and found to be closely consistent with the regularity. 展开更多
关键词 lithium-like ions excited states quantum defect theory quantum defect
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Theoretical study on 2s2p^6np Rydberg states of Cu^(19+)ion
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作者 Zhang Zhen-Rong Cheng Xin-Lu +2 位作者 Liu Zi-Jiang Yang Jian-Hui Li Hui-Fang 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第1期153-157,共5页
We report on the calculations of transition wavelengths and weighted oscillator strengths for 2s22p^6 2s2p^6np (4 〈 n 〈 20) electric dipole (El) transitions of Cu^19+ ion. The flexible atomic code (FAC) has b... We report on the calculations of transition wavelengths and weighted oscillator strengths for 2s22p^6 2s2p^6np (4 〈 n 〈 20) electric dipole (El) transitions of Cu^19+ ion. The flexible atomic code (FAC) has been adopted for the calculations. Comparisons are made with the experimental data available, showing that the present results for 4 〈 n 〈 6 are more accurate than the previous calculated values. Furthermore, combining the quantum defect theory (QDT) with the transition energies of 2s^22p^62s2p^6np, the quantum defects for 2s2p^6np Rydberg series of Cu^19+ ion are determined. In addition, the energies of any highly excited states (n 〉 20) for this series can be reliably predicted using the QDT and the given quantum defects. The ionization energies for Cu^19+ and Cu^20+ ions are also calculated and they excellently accord with previous experimental and calculated values. 展开更多
关键词 Cu^19+ion transition wavelength quantum defect quantum defect theory
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