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Influence of target temperature on alo emission of femtosecond laser-induced Al plasmas

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Plasma Science and Technology 2021年第4期23卷 55-62页

作者： Wei QI Qiuyun WANG Junfeng SHAO Anmin CHEN Mingxing JIN Beijing Institute of Tracking and Telecommunications Technology Beijing 100094People’s Republic of China Institute of Atomic and Molecular Physics Jilin UniversityChangchun 130012People’s Republic of China State Key Laboratory of Laser Interaction With Matter&Innovation Laboratory of Electro-Optical Countermeasures Technology Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033People’s Republic of China

The influence of the target temperature on the molecular emission of femtosecond laser-induced breakdown spectroscopy(LIBS) was investigated experimentally. An Al target was ablated to produce laser-induced plasma. The Al target was uniformly heated to a maximum of 250℃. The measured molecular emission was alo(△ν=0) from the femtosecond LIBS of the Al *** measurements indicated that the molecular emission of alo increased as the temperature of the Al target increased. In addition, a two-temperature model was used to simulate the evolution of the electron and lattice temperature of the Al target with different initial temperatures. The simulated results showed that the electron and lattice temperatures of Al irradiated by the femtosecond laser increased as the initial temperature of the Al target increased;also, the simulated ablated depth increased. Therefore, an increase in the initial Al target temperature resulted in an enhancement in the spectral signal of alo from the femtosecond LIBS of Al,which was directly related to the increase in the size of the ablated crater. The study suggested that increasing the temperature of the target improves the intensity of molecular emission in femtosecond LIBS.

关键词： laser-induced breakdown spectroscopy femtosecond laser sample temperature alo

Formation Mechanism and Emission Spectrum of alo Radicals in Reaction of Laser-ablated Al Atom and Oxygen

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Chemical Research in Chinese Universities 2003年第3期19卷 320-323页

作者： ZHANG Shu-dong LI Hai-Yang Laboratory of Environmental Spectroscopy Anhui Institute of Optics and Fine MechanicsChinese Academy of SciencesHefei 230031P.R.China Graduate School of the Chinese Academy of Sciences Beijing 100039P.R.China Physics and Electronic Engineering College Northwest Normal UniversityLanzhou 730070P.R.China

The emission spectrum of alo radicals was analyzed in 440-540 nm in the reaction of laser ablated Al beam and O 2. The carrier of spectrum was assigned to Δ ν =0, ±1, ±2 vibrational sequences of B 2Σ +-X 2Σ + transition of alo radicals, the observed maximum vibrational quantum number was ν ′=6. The rotational and vibrational temperatures of B state were estimated at 3000 and 7500 K by spectrally simulating the rovibronic population distribution. There is a strong evidence that the production of excited Al( 2 S ) atoms is essential to the formation of excited alo radicals.

关键词： Laser ablation Emission spectrum alo Chemiluminescence reaction

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alo自由基在辐射场中的物理和光谱特性

光谱学与光谱分析 2020年第4期40卷 1023-1027页

作者：吴其俊杜青韩利民汪凌萱贵州理工学院化学工程学院贵州贵阳550003 清华大学物理系北京100084

alo自由基在金属有机化学、催化材料、燃烧化学及天体物理学等领域受到人们的广泛关注,研究外辐射场下对alo自由基的物理特性和光谱特征的影响将有助于更深入理解和增强在相关领域的应用。采用密度泛函理论B3PW91方法,在6-311+G(3df,2p... 详细信息

alo自由基在金属有机化学、催化材料、燃烧化学及天体物理学等领域受到人们的广泛关注,研究外辐射场下对alo自由基的物理特性和光谱特征的影响将有助于更深入理解和增强在相关领域的应用。采用密度泛函理论B3PW91方法,在6-311+G(3df,2p)基组水平上优化了不同辐射场(-0.04~0.04 a.u.)下alo自由基的基态稳定构型,用同样方法计算了该构型的分子结构、总能量、能隙以及红外光谱、拉曼光谱、紫外可见吸收光谱受外辐射场的影响。结果表明,分子结构与辐射场有关。在外辐射场变化范围(-0.04~0.04 a.u.),自由基总能先小幅度增大(-0.03 a.u.达到最大值)后大幅度单调减小;分子键长在负辐射场(-0.04~0 a.u.)没有明显变化,但在(0~0.04 a.u.)正辐射场下单调变长;偶极矩先减小(-0.03 a.u.达到最小值)后增大;而能隙先不断增大(-0.04^-0.02 a.u.),在(-0.02~0.03 a.u.)辐射场能隙基本稳定,随后单调下降。正辐射场(0~0.04 a.u.)对alo自由基的振动频率和红外强度的影响较大, alo自由基在0.04 a.u.辐射场下的红外光谱红移74 cm^-1,其对应光谱强度是未加辐射场的80倍;正辐射场(0~0.04 a.u.)的拉曼光谱红移较明显,在0.04 a.u.红移78 cm^-1;负辐射场(0^-0.04 a.u.)对拉曼光谱影响也较大,在-0.03 a.u.辐射场下具有很强的拉曼活性是未加辐射场的688倍;正辐射场(0~0.04 a.u.)下alo自由基的紫外可见吸收光谱中原来无辐射场下的最大吸收峰(170 nm)蓝移了22 nm且吸收幅度减至一半,在负辐射场范围内(0^-0.04 a.u.)该吸收峰也辐有蓝移其强度也有减弱趋势;alo自由基的无辐射场下第二个最大紫外可见峰在正辐射场作用下,其波长从282 nm一直递减蓝移13 nm和吸收强度递增至2.2倍,负辐射场范围内(0^-0.04 a.u.)该吸收峰红移10 nm和吸收强度递增了6.2倍,超过了无辐射场下最大吸收波长强度。

关键词： alo 辐射场物理特性光谱特性

Photodissociation Dynamics of alo at 193 nm using Time-Sliced Ion Velocity Imaging

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Chinese Journal of Chemical Physics 2020年第5期33卷 649-652,I0079页

作者： Fang-fang Li Yu-jie Ma Jia-xing Liu Guan-jun Wang Feng-yan Wang Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Collaborative Innovation Center of Chemistry for Energy Materials(iChEM)Fudan UniversityShanghai200438China

The photodissociation dynamics of Al O at 193 nm is studied using time-sliced ion velocity *** dissociation channels are found through the speed and angular distributions of aluminum ions:one is one-photon dissociation of the neutral alo to generate Al(2 Pu)+O(3 Pg),and the other is two-photon ionization and then dissociation of alo^+to generate Al^+(1 Sg)+O(3 Pg).Each dissociation channel includes the contribution of alo in the vibrational states v=*** anisotropy parameter of the neutral dissociation channel is more dependent on the vibration state of alo than the ion dissociation channel.

关键词： Time-sliced ion velocity imaging Photodissociation alo Vibrational state 193 nm

射流冷却alo自由基B^2Σ^+—X^2Σ^+光谱研究

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物理学报 2000年第9期49卷 1689-1691页

作者：金瑾陈暘裴林森胡长进马兴孝陈从香中国科学技术大学选键化学开放实验室化学物理系合肥230026

利用铝电极放电产生的Al原子与O2 反应生成alo自由基 ,在超声射流冷却下在 430— 480nm波长范围观测到alo自由基B—X跃迁的激光诱导荧光激发谱 .光谱振动结构分析表明所有的谱带属于V′ -V″ =1,2 ,3跃迁 ,并获得基态和激发态的振动频... 详细信息

利用铝电极放电产生的Al原子与O2 反应生成alo自由基 ,在超声射流冷却下在 430— 480nm波长范围观测到alo自由基B—X跃迁的激光诱导荧光激发谱 .光谱振动结构分析表明所有的谱带属于V′ -V″ =1,2 ,3跃迁 ,并获得基态和激发态的振动频率与非谐性常数 .另外还对其中 (1,4)谱带的转动结构进行标识 ,并得到相应的转动常数和离心畸变系数 .对从基态振动能级V″ =5向上跃迁的谱带强度增强进行了讨论 .

关键词：光谱 alo 自由基射流冷却双原子

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alo分子基态势能曲线的理论研究

河南师范大学学报（自然科学版） 2013年第3期41卷 68-70,78页

作者：寇素华刘艳郎建华张澍林朱遵略河南师范大学物理与电子工程学院河南新乡453007 河南师范大学计算机与信息工程学院河南新乡453007

采用完全活化空间自洽场(CASSCF)方法及内收缩多参考组态相互作用(MRCI)理论,对alo分子基态(X2Σ+)的势能曲线进行了理论研究.在得到De,Re,ωe,ωeχe,Be,αe等光谱常数的基础上,通过求解分子核运动的径向Schrdinger方程,找到了J=0时... 详细信息

采用完全活化空间自洽场(CASSCF)方法及内收缩多参考组态相互作用(MRCI)理论,对alo分子基态(X2Σ+)的势能曲线进行了理论研究.在得到De,Re,ωe,ωeχe,Be,αe等光谱常数的基础上,通过求解分子核运动的径向Schrdinger方程,找到了J=0时该分子基态存在的64个全部振动态.并第一次全面计算了每一振动态的振动能级、经典转折点、转动惯量Bυ和离心畸变常数Dυ与现有实验及其它理论相比较,本文的计算结果更为全面精确.

关键词： alo 基态势能曲线振动能级

A alo-LSSVM Model for the Cell Voltage Optimization in Aluminum Electrolysis Process

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A ALO-LSSVM Model for the Cell Voltage Optimization in Alumi...

第三十九届中国控制会议

作者： Chen-hua Xu Jin-zhi Zhang Ruo-jun Cheng Rui Chen Zhu-guang Luo Hao-ran Li Department of Electrical Engineering Guangxi University

The aluminum reduction is a typical industry with high-energy consumption,and one of the ways to effectively solve the problem of high energy consumption is to reduce the cell voltage in a proper *** is hard to express the relationship between the cell voltage and the corresponding technical *** present,data mining technology highly automated analysis of enterprise data is usually used to find the optimal cell voltage and its corresponding optimal technical *** order to improve the accuracy of the model,the method of density-based spatial clustering of applications with noise(DBSCAN)is adopted to remove the abnormal operating points from the raw ***,in order to realize the real-time measurement of cell voltage,the prediction model of cell voltage is established by least squares support vector machine(LSSVM),and optimized by Ant Lion Optimizer(alo).Additionally,the cell voltage optimization control model is developed by analysis of the technical *** cell voltage optimization control model is solved by using the alo *** simulation results reveal that the adoption of alo-LSSVM model significantly improves the robustness and accuracy of the cell voltage prediction,and it provides a powerful technical preparation for optimizing cell *** experimental effect shows that the alo model is stable,and the average value of cell voltage optimization is 3.8647 *** is used to guide process operation,and the theoretical DC power consumption is 14.9% lower than before optimization,achieving energy saving.

关键词： Aluminum Electrolysis Process Cluster Analysis Cell Voltage LSSVM alo

来源： cnki会议评论

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alo(0.0)谱带转动结构的分析

物理实验 1983年第5期 197-199页

作者：李村涓王守叶张玉政东北工学院物理系

为了配合高校原子物理课中分子结构和分子光谱一章的教学,我们排出“alo电子光谱带系振动结构的研究”实验之后,又对它的(0.0)谱带转动结构进行了分析,求出alo双原子分子的转动常数,得到了较好的结果。

关键词：振动量子数转动结构 AIO 谱线波数分子转动惯量 alo 谱带分子光谱学

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alo电子光谱带系振动结构的研究

物理实验 1982年第2期 58-61页

作者：李村涓赵洪生东北工学院物理系

在高校的近代物理实验中双原子分子光谱的实验,多用CO、C2放电管作为光源,或用纯碳棒在空气中激发而产生CN光谱。前者曝光时间较长,后者谱带较少。我们用纯铝棒在空气中用交流电弧光源激发,在可见光波段得到alo的带状光谱,使用小型棱镜... 详细信息

在高校的近代物理实验中双原子分子光谱的实验,多用CO、C2放电管作为光源,或用纯碳棒在空气中激发而产生CN光谱。前者曝光时间较长,后者谱带较少。我们用纯铝棒在空气中用交流电弧光源激发,在可见光波段得到alo的带状光谱,使用小型棱镜摄谱仪用于实验教学,效果较好。 alo双原子分子在3000K—4000K形成,因此,Coheur F.P.等人曾利用alo带状光谱来测量电弧温度。西德气体放电光谱学专家***-Holtgreven于1980年在复

关键词：双原子分子谱带电子光谱 alo 带系