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Spectrochimica acta. Part A: Molecular spectroscopy最新文献

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The low temperature Fourier Transform Raman spectrum of polystyrenes 聚苯乙烯的低温傅立叶变换拉曼光谱
Spectrochimica acta. Part A: Molecular spectroscopy Pub Date : 1994-10-01 DOI: 10.1016/0584-8539(94)80208-4
I.J. Wesley, P.J. Hendra
{"title":"The low temperature Fourier Transform Raman spectrum of polystyrenes","authors":"I.J. Wesley,&nbsp;P.J. Hendra","doi":"10.1016/0584-8539(94)80208-4","DOIUrl":"10.1016/0584-8539(94)80208-4","url":null,"abstract":"<div><p>In a previous paper (Jones and Wesley, <em>Spectrochimica Acta</em> <strong>47A</strong> (9/10), 1293 (1991)) the Fourier Transform (FT) Raman spectra of various polystyrenes were presented and differences in the spectra in terms of the configuration, conformation and crystallinity of the samples were discussed. In this paper the low temperature FT Raman spectra of polystyrenes are presented. The differences between the spectra as a function of temperature and crystallinity are discussed. It is clear that, although lowering the temperature is advantageous in improving the quality of the spectra, crystallinity is the key to quality in the spectra. Isomeric purity alone seems to be far less advantageous. It is proposed that the band near 1000 cm<sup>−1</sup> in this system can be used to estimate the crystallinity. The paper concludes with some comments on the very slow crystallization rate of typical isotactic polystyrene.</p></div>","PeriodicalId":82782,"journal":{"name":"Spectrochimica acta. Part A: Molecular spectroscopy","volume":"50 11","pages":"Pages 1959-1966"},"PeriodicalIF":0.0,"publicationDate":"1994-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0584-8539(94)80208-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82962600","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
Vibrational spectroscopic characterization of cobalt dimethylglyoxime boron difluoride ag 二甲基乙氧肟二氟化硼钴的振动光谱表征
Spectrochimica acta. Part A: Molecular spectroscopy Pub Date : 1994-10-01 DOI: 10.1016/0584-8539(94)80202-5
E.E. Lawson, H.G.M. Edwards, A.F. Johnson
{"title":"Vibrational spectroscopic characterization of cobalt dimethylglyoxime boron difluoride ag","authors":"E.E. Lawson,&nbsp;H.G.M. Edwards,&nbsp;A.F. Johnson","doi":"10.1016/0584-8539(94)80202-5","DOIUrl":"10.1016/0584-8539(94)80202-5","url":null,"abstract":"<div><p>The Fourier-transform Raman and IR spectra of cobalt dimethylglyoxime boron difluoride (cobaloxime boron difluoride) have been obtained, and vibrational assignments made. The assignments were consistent with the symmetry group <em>D</em><sub>2<em>h</em></sub> for the molecular skeleton, although some variation from the vibrational activity of this point group for the methyl group vibrations was ascribed to the local symmetry group, C<sub>3ν</sub>, and non-planarity about the nitrogen atoms. Raman and IR spectra of nickel dimethylglyoxime were recorded and used for comparison purposes to aid the assignment of the cobaloxime boron difluoride bands. Cobalt dimethylglyoxime boron difluoride and other cobaloxime-based structures have been proposed for use as chain-transfer catalysts in free-radical polymerization chemistry.</p></div>","PeriodicalId":82782,"journal":{"name":"Spectrochimica acta. Part A: Molecular spectroscopy","volume":"50 11","pages":"Pages 1899-1907"},"PeriodicalIF":0.0,"publicationDate":"1994-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0584-8539(94)80202-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82557300","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: 1
Fourier-transform Raman and infrared spectra and normal coordinate analysis of (C6H5)2BiCl and [N(CH3)4]+[(C6H5)2BiCl2]− (C6H5)2BiCl和[N(CH3)4]+[(C6H5)2BiCl2]的傅里叶变换拉曼光谱和红外光谱及正坐标分析
Spectrochimica acta. Part A: Molecular spectroscopy Pub Date : 1994-10-01 DOI: 10.1016/0584-8539(94)80199-1
H.-J. Götze, P. Lemannczick, B. Schaaf
{"title":"Fourier-transform Raman and infrared spectra and normal coordinate analysis of (C6H5)2BiCl and [N(CH3)4]+[(C6H5)2BiCl2]−","authors":"H.-J. Götze,&nbsp;P. Lemannczick,&nbsp;B. Schaaf","doi":"10.1016/0584-8539(94)80199-1","DOIUrl":"10.1016/0584-8539(94)80199-1","url":null,"abstract":"<div><p>The vibrational properties of the diphenylbismuth(III) chloride compounds (C<sub>6</sub>H<sub>5</sub>)<sub>2</sub>BiCl and [N(CH<sub>3</sub>)<sub>4</sub>]<sup>+</sup>[(C<sub>6</sub>H<sub>5</sub>)<sub>2</sub>BiCl<sub>2</sub>]<sup>−</sup> have been investigated. A comprehensive assignment of the fundamental modes in the measured Fourier-transform Raman and infrared spectra has been carried out. Normal coordinate calculations of these compounds based on new X-ray crystal structure data have been performed to identify the BiCl stretching and bending vibrations of both compounds. For [N(CH<sub>3</sub>)<sub>4</sub>]<sup>+</sup>[(C<sub>6</sub>H<sub>5</sub>)<sub>2</sub>BiCl<sub>2</sub>]<sup>−</sup> in the solid state, the ν<sub>s</sub>(BiCl<sub>2</sub>) and ν<sub>as</sub>(BiCl<sub>2</sub>) occur at 215 cm<sup>−</sup> (Raman) and 237 cm<sup>−</sup> (Raman), respectively, in good agreement with the calculated wavenumbers. The force constant calculation yields a BiCl stretching force constant of 0.89 × 10<sup>2</sup> N m<sup>−1</sup>.</p></div>","PeriodicalId":82782,"journal":{"name":"Spectrochimica acta. Part A: Molecular spectroscopy","volume":"50 11","pages":"Pages 1871-1878"},"PeriodicalIF":0.0,"publicationDate":"1994-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0584-8539(94)80199-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83517051","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: 5
Application of FT-Raman spectroscopy to the study of the benzotriazole inhibition of acid copper corrosion 应用傅里叶变换拉曼光谱研究苯并三唑对酸性铜腐蚀的抑制作用
Spectrochimica acta. Part A: Molecular spectroscopy Pub Date : 1994-10-01 DOI: 10.1016/0584-8539(94)80214-9
G.A. Hope, D.P. Schweinsberg, P.M. Fredericks
{"title":"Application of FT-Raman spectroscopy to the study of the benzotriazole inhibition of acid copper corrosion","authors":"G.A. Hope,&nbsp;D.P. Schweinsberg,&nbsp;P.M. Fredericks","doi":"10.1016/0584-8539(94)80214-9","DOIUrl":"10.1016/0584-8539(94)80214-9","url":null,"abstract":"<div><p>The initial stages of the corrosion protection of copper surfaces by benzotriazole in sulfuric acid solution are investigated using FT-Raman SERS and X-ray photoelectron spectroscopy. Spectra are measured in the presence of ppm levels of inhibitor on a copper surface <em>in situ</em>. The dependence of the adsorbate spectra on the electrode potential, solution pH, oxidation/reduction cycles and time is observed. Good spectra are obtained from copper electrodes prepared using <em>in situ</em> oxidation/reduction cycling in low pH sulfate solutions free from chloride at negative potentials.</p></div>","PeriodicalId":82782,"journal":{"name":"Spectrochimica acta. Part A: Molecular spectroscopy","volume":"50 11","pages":"Pages 2019-2026"},"PeriodicalIF":0.0,"publicationDate":"1994-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0584-8539(94)80214-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75237760","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: 24
A review of the theory of Fourier-transform Raman spectroscopy 傅立叶变换拉曼光谱理论综述
Spectrochimica acta. Part A: Molecular spectroscopy Pub Date : 1994-10-01 DOI: 10.1016/0584-8539(94)80197-5
Stewart F. Parker
{"title":"A review of the theory of Fourier-transform Raman spectroscopy","authors":"Stewart F. Parker","doi":"10.1016/0584-8539(94)80197-5","DOIUrl":"10.1016/0584-8539(94)80197-5","url":null,"abstract":"<div><p>This paper reviews the process of obtaining a Fourier-transform Raman spectrum and examines each step from recording the interferogram through the Fourier transform. The effects of the real world as manifested by finite resolution, beam divergence, asymmetric interferograms and discrete sampling are discussed and how the compromises imposed by them are accommodated.</p></div>","PeriodicalId":82782,"journal":{"name":"Spectrochimica acta. Part A: Molecular spectroscopy","volume":"50 11","pages":"Pages 1841-1856"},"PeriodicalIF":0.0,"publicationDate":"1994-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0584-8539(94)80197-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78168511","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: 21
List of special issues 特刊一览表
Spectrochimica acta. Part A: Molecular spectroscopy Pub Date : 1994-10-01 DOI: 10.1016/0584-8539(94)80217-3
{"title":"List of special issues","authors":"","doi":"10.1016/0584-8539(94)80217-3","DOIUrl":"https://doi.org/10.1016/0584-8539(94)80217-3","url":null,"abstract":"","PeriodicalId":82782,"journal":{"name":"Spectrochimica acta. Part A: Molecular spectroscopy","volume":"50 11","pages":"Page I"},"PeriodicalIF":0.0,"publicationDate":"1994-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0584-8539(94)80217-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"137005074","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
Fourier-transform raman spectroscopy of minerals 矿物的傅里叶变换拉曼光谱
Spectrochimica acta. Part A: Molecular spectroscopy Pub Date : 1994-10-01 DOI: 10.1016/0584-8539(94)80203-3
Esther E. Coleyshaw, William P. Griffith, Robert J. Bowell
{"title":"Fourier-transform raman spectroscopy of minerals","authors":"Esther E. Coleyshaw,&nbsp;William P. Griffith,&nbsp;Robert J. Bowell","doi":"10.1016/0584-8539(94)80203-3","DOIUrl":"10.1016/0584-8539(94)80203-3","url":null,"abstract":"<div><p>The FTR spectra of a variety of minerals are reported, comprising carbonates, phosphates, arsenates, vanadates, sulphates, molybdates, tungstates, oxides and sulphides. It is shown that FTR can be a fast, non-destructive technique for the study of such minerals.</p></div>","PeriodicalId":82782,"journal":{"name":"Spectrochimica acta. Part A: Molecular spectroscopy","volume":"50 11","pages":"Pages 1909-1918"},"PeriodicalIF":0.0,"publicationDate":"1994-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0584-8539(94)80203-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82253776","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: 55
Raman spectroscopy of powders: Effects of light absorption and scattering 粉末的拉曼光谱:光吸收和散射的影响
Spectrochimica acta. Part A: Molecular spectroscopy Pub Date : 1994-10-01 DOI: 10.1016/0584-8539(94)80196-7
David N. Waters
{"title":"Raman spectroscopy of powders: Effects of light absorption and scattering","authors":"David N. Waters","doi":"10.1016/0584-8539(94)80196-7","DOIUrl":"10.1016/0584-8539(94)80196-7","url":null,"abstract":"<div><p>New expressions are derived from Kubelka—Munk theory to describe the Raman intensities observed by back-scattering from powder samples. The equations relate the Raman intensity to the diffuse reflectance <em>R</em><sub>∞</sub> of the sample for two cases: (i) for a series of samples having constant values of the scattering coefficient, <em>s</em>, but which vary in their values of the absorption coefficient, <em>k</em>; and (ii) for a series of samples having constant values of <em>k</em>, but differing in their values of <em>s</em>. The predicted intensity dependences are compared with the results of experiment.</p></div>","PeriodicalId":82782,"journal":{"name":"Spectrochimica acta. Part A: Molecular spectroscopy","volume":"50 11","pages":"Pages 1833-1840"},"PeriodicalIF":0.0,"publicationDate":"1994-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0584-8539(94)80196-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77094092","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: 33
Applications of Raman spectroscopy to the analysis of natural rubber 拉曼光谱在天然橡胶分析中的应用
Spectrochimica acta. Part A: Molecular spectroscopy Pub Date : 1994-10-01 DOI: 10.1016/0584-8539(94)80210-6
Patrick J. Hendra, Kevin D.O. Jackson
{"title":"Applications of Raman spectroscopy to the analysis of natural rubber","authors":"Patrick J. Hendra,&nbsp;Kevin D.O. Jackson","doi":"10.1016/0584-8539(94)80210-6","DOIUrl":"10.1016/0584-8539(94)80210-6","url":null,"abstract":"<div><p>The technique of Raman spectroscopy has been available for over 60 years but the analysis of elastomers has been dogged by problems of fluorescence. The introduction of Fourier transform collection techniques and spectral accumulation, coupled with the advantages of using a near-IR laser as an excitation source, have removed many of the barriers to the application of this technique within a routine laboratory environment. This paper describes some of the areas related to the analysis of natural rubber which have been investigated using this technique. Of particular interest is the observation of main chain modifications during vulcanization and the ability to observe the conversion of insoluble to soluble sulphur under conditions appropriate to compounding and vulcanization. The influence of crystallization, both temperature and strain induced, on the FT-Raman spectrum of natural rubber is also demonstrated.</p></div>","PeriodicalId":82782,"journal":{"name":"Spectrochimica acta. Part A: Molecular spectroscopy","volume":"50 11","pages":"Pages 1987-1997"},"PeriodicalIF":0.0,"publicationDate":"1994-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0584-8539(94)80210-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91392953","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: 19
Surface hydration of aqueous calcium minerals as studied by Fourier transform Raman and infrared spectroscopy 傅里叶变换拉曼光谱和红外光谱研究了含水钙矿物的表面水化
Spectrochimica acta. Part A: Molecular spectroscopy Pub Date : 1994-10-01 DOI: 10.1016/0584-8539(94)80198-3
Allan Holmgren, Liuming Wu, Willis Forsling
{"title":"Surface hydration of aqueous calcium minerals as studied by Fourier transform Raman and infrared spectroscopy","authors":"Allan Holmgren,&nbsp;Liuming Wu,&nbsp;Willis Forsling","doi":"10.1016/0584-8539(94)80198-3","DOIUrl":"10.1016/0584-8539(94)80198-3","url":null,"abstract":"<div><p>Rapid hydration reactions of several calcium minerals are studied using Fourier transform (FT) Raman and infrared (IR) spectroscopy. Oleate adsorption over aqueous synthetic fluorite, calcite and gypsum (pH 9) is investigated and adsorption mechanisms are discussed.</p></div>","PeriodicalId":82782,"journal":{"name":"Spectrochimica acta. Part A: Molecular spectroscopy","volume":"50 11","pages":"Pages 1857-1869"},"PeriodicalIF":0.0,"publicationDate":"1994-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0584-8539(94)80198-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77182920","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: 18
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