International Journal of Spectroscopy最新文献_第2页

Electron Density from Balmer Series Hydrogen Lines and Ionization Temperatures in Inductively Coupled Argon Plasma Supplied by Aerosol and Volatile Species 气溶胶和挥发性物质提供的电感耦合氩等离子体中Balmer系列氢谱线的电子密度和电离温度

International Journal of Spectroscopy Pub Date : 2016-03-22 DOI: 10.1155/2016/7521050

J. Borkowska-burnecka, W. Żyrnicki, M. Wełna, P. Jamróz

{"title":"Electron Density from Balmer Series Hydrogen Lines and Ionization Temperatures in Inductively Coupled Argon Plasma Supplied by Aerosol and Volatile Species","authors":"J. Borkowska-burnecka, W. Żyrnicki, M. Wełna, P. Jamróz","doi":"10.1155/2016/7521050","DOIUrl":"https://doi.org/10.1155/2016/7521050","url":null,"abstract":"Electron density and ionization temperatures were measured for inductively coupled argon plasma at atmospheric pressure. Different sample introduction systems were investigated. Samples containing Sn, Hg, Mg, and Fe and acidified with hydrochloric or acetic acids were introduced into plasma in the form of aerosol, gaseous mixture produced in the reaction of these solutions with NaBH4 and the mixture of the aerosol and chemically generated gases. The electron densities measured from Hα, Hβ, Hγ, and Hδ lines on the base of Stark broadening were compared. The study of the H Balmer series line profiles showed that the values from Hγ and Hδ were well consistent with those obtained from Hβ which was considered as a common standard line for spectroscopic measurement of electron density. The values varied from to cm−3 and were the highest at loading mixture of chemically generated gases. The ionization temperatures of plasma, determined on the base of the Saha approach from ion-to-atom line intensity ratios, were lower for Sn and Hg (6500–7200 K) than those from Fe and Mg lines (7000–7800 K). The Sn II/Sn I and Hg II/Hg I, Fe II/Fe I, and Mg II/Mg I intensity ratios and the electron densities () were dependent on experimental conditions of plasma generation. Experimental and theoretically calculated ionization degrees were compared.","PeriodicalId":14329,"journal":{"name":"International Journal of Spectroscopy","volume":"5 1","pages":"1-9"},"PeriodicalIF":0.0,"publicationDate":"2016-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73245082","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

The Technological Enhancement of Normally Occurring Radioactive Materials in Red Mud Due to the Production of Alumina 氧化铝生产赤泥中正常放射性物质的工艺强化

International Journal of Spectroscopy Pub Date : 2016-03-16 DOI: 10.1155/2016/4589460

M. Miller, D. Miller

引用次数: 8

Synthesis and Light Induced Characteristics of Siloxane Substituted Azobenzene: An Application for Optical Storage Device 硅氧烷取代偶氮苯的合成及其光致特性:在光存储器件中的应用

International Journal of Spectroscopy Pub Date : 2016-03-10 DOI: 10.1155/2016/4715230

A. R. Yuvaraj, M. L. Rahman, M. Yusoff

引用次数: 6

Double Pulse LIBS of Titanium-Based PVD-Coatings with Submicron Resolution 亚微米分辨率钛基pvd涂层的双脉冲LIBS

International Journal of Spectroscopy Pub Date : 2016-03-06 DOI: 10.1155/2016/2504217

K. Ermalitskaia, E. Voropay

引用次数: 0

Chain Length and Thermal Sensitivity of the Infrared Spectra of a Homologous Series of Anhydrous Silver(I) n-Alkanoates 同源系列无水正烷酸银(I)的链长和红外光谱的热敏性

International Journal of Spectroscopy Pub Date : 2016-02-29 DOI: 10.1155/2016/3068430

P. Nelson

{"title":"Chain Length and Thermal Sensitivity of the Infrared Spectra of a Homologous Series of Anhydrous Silver(I) n-Alkanoates","authors":"P. Nelson","doi":"10.1155/2016/3068430","DOIUrl":"https://doi.org/10.1155/2016/3068430","url":null,"abstract":"The thermal and chain length sensitivity of the infrared spectra of some solid state anhydrous silver(I) salts (n-octanoate to n-eicosanoate, inclusive) are discussed. At ambient temperature, the tilted alkyl chains, anchored to the metal planes via chelating bidentate coordination to the silver ions, are crystallized in the fully extended all-trans conformation. Interestingly, though all compounds are crystallized in a monoclinic crystal system, their lateral chain packing, van der Waals effects, and hence vibrational features are chain length-dependent. This is a direct result of electrostatic effects of the COO group in addition to vibrational coupling between CH2, CH3, and COO modes, an effect which varies significantly with chain length. Variable temperature infrared measurements indicate significant irreversible changes in the metal-carboxyl coordination sphere, most likely due to bond fission. For long chain adducts (), thermally induced crystal system switching, monoclinic to triclinic, indicates greater thermal sensitivity of their alkyl chains. During heating, the regions of the hydrocarbon chains, furthest from the COO, become increasingly molten and mobile as the stepwise melt advances towards the solid COO moieties. This solid-liquid melting behaviour is responsible for mesophase formation in metal carboxylate systems.","PeriodicalId":14329,"journal":{"name":"International Journal of Spectroscopy","volume":"30 2 1","pages":"1-9"},"PeriodicalIF":0.0,"publicationDate":"2016-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73188898","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 13

Cathodoluminescence and Raman Spectromicroscopy of Forsterite in Tagish Lake Meteorite: Implications for Astromineralogy 塔吉什湖陨石中橄榄石的阴极发光和拉曼光谱显微研究:天体矿物学意义

International Journal of Spectroscopy Pub Date : 2016-02-22 DOI: 10.1155/2016/1751730

A. Gucsik, I. Gyollai, H. Nishido, K. Ninagawa, M. Izawa, C. Jäger, U. Ott, I. Simonia, S. Bérczi, andMasahiro Kayama

{"title":"Cathodoluminescence and Raman Spectromicroscopy of Forsterite in Tagish Lake Meteorite: Implications for Astromineralogy","authors":"A. Gucsik, I. Gyollai, H. Nishido, K. Ninagawa, M. Izawa, C. Jäger, U. Ott, I. Simonia, S. Bérczi, andMasahiro Kayama","doi":"10.1155/2016/1751730","DOIUrl":"https://doi.org/10.1155/2016/1751730","url":null,"abstract":"The Tagish Lake meteorite is CI/CM2 chondrite, which fell by a fireball event in January 2000. This study emphasizes the cathodoluminescence (CL) and Raman spectroscopical properties of the Tagish Lake meteorite in order to classify the meteoritic forsterite and its relation to the crystallization processes in a parent body. The CL-zoning of Tagish Lake meteorite records the thermal history of chondrules and terrestrial weathering. Only the unweathered olivine is forsterite, which is CL-active. The variation of luminescence in chondrules of Tagish Lake meteorite implies chemical inhomogeneity due to low-grade thermal metamorphism. The blue emission center in forsterite due to crystal lattice defect is proposed as being caused by rapid cooling during the primary crystallization and relatively low-temperature thermal metamorphism on the parent body of Tagish Lake meteorite. This is in a good agreement with the micro-Raman spectroscopical data. A combination of cathodoluminescence and micro-Raman spectroscopies shows some potentials in study of the asteroidal processes of parent bodies in solar system.","PeriodicalId":14329,"journal":{"name":"International Journal of Spectroscopy","volume":"60 1","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2016-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82950896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Interaction of Small Zinc Complexes with Globular Proteins and Free Tryptophan 小锌配合物与球状蛋白和游离色氨酸的相互作用

International Journal of Spectroscopy Pub Date : 2016-02-16 DOI: 10.1155/2016/1378680

J. Butkus, Shelby O’Riley, B. Chohan, Swarna Basu

{"title":"Interaction of Small Zinc Complexes with Globular Proteins and Free Tryptophan","authors":"J. Butkus, Shelby O’Riley, B. Chohan, Swarna Basu","doi":"10.1155/2016/1378680","DOIUrl":"https://doi.org/10.1155/2016/1378680","url":null,"abstract":"A series of eight water soluble anionic, cationic, and neutral zinc(II) complexes were synthesized and characterized. The interaction of these complexes with bovine serum albumin (BSA), human serum albumin (HSA), lysozyme, and free tryptophan (Trp) was investigated using steady-state fluorescence spectroscopy. Static and dynamic fluorescence quenching analysis based on Stern-Volmer kinetics was conducted, and the decrease in fluorescence intensity of the Trp residue(s) can be ascribed predominantly to static quenching that occurs when the Zn complex binds to the protein and forms a nonfluorescent complex. The role played by the nature of the ligand, the metal, and complex charge in quenching Trp fluorescence was investigated. The binding association constants () ranged from 104 to 1010 M−1 and indicate that complexes with planar aromatic features have the strongest affinity for globular proteins and free Trp. Complexes with nonaromatic features failed to interact with these proteins at or in the vicinity of the Trp residues. These interactions were studied over a range of temperatures, and binding was found to weaken with the increase in temperature and was exothermic with a negative change in entropy. The thermodynamic parameters suggest that binding of Zn complexes to the proteins is a highly spontaneous and favorable process.","PeriodicalId":14329,"journal":{"name":"International Journal of Spectroscopy","volume":"22 1","pages":"1-12"},"PeriodicalIF":0.0,"publicationDate":"2016-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83289296","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 11

Understanding the Crystallinity Indices Behavior of Burned Bones and Teeth by ATR-IR and XRD in the Presence of Bioapatite Mixed with Other Phosphate and Carbonate Phases 用ATR-IR和XRD研究生物磷灰石与其他磷酸盐和碳酸盐混合存在下烧伤骨和牙齿的结晶度指数行为

International Journal of Spectroscopy Pub Date : 2016-01-24 DOI: 10.1155/2016/4810149

G. Piga, D. Gonçalves, T. Thompson, A. Brunetti, A. Malgosa, S. Enzo

引用次数: 42

The Heteronuclear Multiple-Quantum Correlation Experiment: Perspective from Classical Vectors, Nonclassical Vectors, and Product Operators 异核多量子相关实验:从经典向量、非经典向量和乘积算子的视角

International Journal of Spectroscopy Pub Date : 2016-01-06 DOI: 10.1155/2016/2390109

K. Vega-Hernández, M. Antuch

{"title":"The Heteronuclear Multiple-Quantum Correlation Experiment: Perspective from Classical Vectors, Nonclassical Vectors, and Product Operators","authors":"K. Vega-Hernández, M. Antuch","doi":"10.1155/2016/2390109","DOIUrl":"https://doi.org/10.1155/2016/2390109","url":null,"abstract":"It is usually accepted that most 2D-NMR experiments cannot be approached using classical models. Instructors argue that Product Operators (PO) or density matrix formalisms are the only alternative to get insights into complex spin evolution for experiments involving Multiple-Quantum Coherence, such as the Heteronuclear Multiple-Quantum Correlation (HMQC) technique. Nevertheless, in recent years, several contributions have been published to provide vectorial descriptions for the HMQC taking PO formalism as the starting point. In this work we provide a graphical representation of the HMQC experiment, taking the basic elements of Bloch’s vector model as building blocks. This description bears an intuitive and comfortable understanding of spin evolution during the pulse sequence, for those who are novice in 2D-NMR. Finally, this classical vectorial depiction is tested against the PO formalism and nonclassical vectors, conveying the didactic advantage of shedding light on a single phenomenon from different perspectives. This comparative approach could be useful to introduce PO and nonclassical vectors for advanced upper-division undergraduate and graduate education.","PeriodicalId":14329,"journal":{"name":"International Journal of Spectroscopy","volume":"27 1","pages":"1-9"},"PeriodicalIF":0.0,"publicationDate":"2016-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74347055","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

External Quantum Efficiency Improvement with Luminescent Downshifting Layers: Experimental and Modelling 用发光降移层提高外量子效率:实验和模型

International Journal of Spectroscopy Pub Date : 2016-01-05 DOI: 10.1155/2016/8543475

H. Ahmed, S. McCormack, J. Doran

引用次数: 29